diff --git a/.github/workflows/post-rca-comment.yml b/.github/workflows/post-rca-comment.yml
new file mode 100644
index 0000000..72638fc
--- /dev/null
+++ b/.github/workflows/post-rca-comment.yml
@@ -0,0 +1,40 @@
+name: Post Root Cause Analysis Comment
+
+on:
+  workflow_dispatch:
+    inputs:
+      issue_number:
+        description: 'Issue number to comment on'
+        required: true
+        default: '12'
+
+permissions:
+  issues: write
+  contents: read
+
+jobs:
+  post-comment:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Post Root Cause Analysis
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const issueNumber = ${{ github.event.inputs.issue_number }};
+            
+            // Read the root cause analysis file
+            const commentBody = fs.readFileSync('Act-3/ROOT_CAUSE_ANALYSIS.md', 'utf8');
+            
+            // Post the comment
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: issueNumber,
+              body: commentBody
+            });
+            
+            console.log(`Posted root cause analysis to issue #${issueNumber}`);
diff --git a/Act-3/HOW_TO_POST_RCA.md b/Act-3/HOW_TO_POST_RCA.md
new file mode 100644
index 0000000..7c9cd30
--- /dev/null
+++ b/Act-3/HOW_TO_POST_RCA.md
@@ -0,0 +1,42 @@
+# How to Post the Root Cause Analysis to GitHub Issue
+
+The root cause analysis for the ArgoCD deployment failure has been completed and documented in `ROOT_CAUSE_ANALYSIS.md`.
+
+## Automated Options
+
+### Option 1: Using GitHub CLI
+```bash
+cd Act-3
+gh issue comment 12 --body-file ROOT_CAUSE_ANALYSIS.md
+```
+
+### Option 2: Using the Bash Script
+```bash
+cd Act-3
+export GITHUB_TOKEN="your_github_token_here"
+./post-rca-to-issue.sh 12
+```
+
+### Option 3: Using GitHub Actions Workflow
+1. Go to the Actions tab in the repository
+2. Select "Post Root Cause Analysis Comment" workflow
+3. Click "Run workflow"
+4. Enter issue number: `12`
+5. Click "Run workflow"
+
+## Manual Option
+
+If automated options are not available:
+
+1. Open the GitHub issue: https://github.com/DevExpGbb/agentic-platform-engineering/issues/12
+2. Copy the content from `ROOT_CAUSE_ANALYSIS.md`
+3. Paste it as a new comment on the issue
+4. Click "Comment"
+
+## Summary of Findings
+
+**Root Cause:** Invalid Kubernetes manifest with malformed `apiVersion` field  
+**Location:** `apps/broken-aks-store-all-in-one.yaml` line 178 in source repository  
+**Issue:** `apiVersion: apps/v` should be `apiVersion: apps/v1`  
+
+See `ROOT_CAUSE_ANALYSIS.md` for complete details and remediation recommendations.
diff --git a/Act-3/INVESTIGATION_SUMMARY.md b/Act-3/INVESTIGATION_SUMMARY.md
new file mode 100644
index 0000000..c247d92
--- /dev/null
+++ b/Act-3/INVESTIGATION_SUMMARY.md
@@ -0,0 +1,87 @@
+# Investigation Summary: ArgoCD Deployment Failure
+
+**Date:** 2026-02-03  
+**Issue:** #12 - 🚨 ArgoCD Deployment Failed: 2-broken-apps  
+**Application:** 2-broken-apps  
+**Status:** ✅ Root Cause Identified
+
+---
+
+## Executive Summary
+
+The ArgoCD deployment failure for the `2-broken-apps` application has been thoroughly investigated. The root cause has been identified as an **intentionally broken Kubernetes manifest** in the source repository used for testing the ArgoCD notification system.
+
+## Root Cause
+
+**Problem:** Invalid `apiVersion` field in Deployment manifest  
+**Location:** `https://github.com/dcasati/argocd-notification-examples.git`  
+- File: `apps/broken-aks-store-all-in-one.yaml`  
+- Line: 178  
+- Current value: `apiVersion: apps/v` (incomplete)  
+- Expected value: `apiVersion: apps/v1` (complete)
+
+**Affected Resource:** `order-service` Deployment
+
+## Why This Matters
+
+- Kubernetes cannot parse manifests with invalid `apiVersion` values
+- ArgoCD validation fails before attempting to apply the resource
+- Results in "synchronization tasks are not valid" error
+- Application remains in "Degraded" health and "OutOfSync" status
+
+## Context
+
+Based on analysis of the repository and commit history:
+
+1. **Repository Name:** `argocd-notification-examples` - suggests this is a testing repository
+2. **Commit Message:** "break apiVersion formatting in deployment YAML" - explicitly indicates intentional breakage
+3. **Purpose:** This appears to be a test case to validate the ArgoCD notification system
+
+**Result:** ✅ The notification system is working correctly. The automated workflow successfully detected the failure and created GitHub issue #12.
+
+## Documentation Provided
+
+All findings have been documented in:
+
+1. **`Act-3/ROOT_CAUSE_ANALYSIS.md`** - Complete technical analysis with:
+   - Detailed problem description
+   - 4 remediation options
+   - Verification steps
+   - Investigation methodology
+
+2. **`Act-3/HOW_TO_POST_RCA.md`** - Instructions for posting the analysis to GitHub issue
+
+3. **`Act-3/post-rca-to-issue.sh`** - Bash script for automated posting (requires GitHub token)
+
+4. **`.github/workflows/post-rca-comment.yml`** - GitHub Actions workflow for posting via UI
+
+## Next Steps
+
+### If This Is a Test (Most Likely)
+- ✅ Mark test as successful - notification system is working
+- Consider closing the application: `argocd app delete 2-broken-apps`
+- Update documentation about the test case
+
+### If This Needs to Be Fixed
+- Follow Option 1 in `ROOT_CAUSE_ANALYSIS.md` to fix the source repository
+- Change line 178: `apiVersion: apps/v` → `apiVersion: apps/v1`
+- Commit, push, and trigger ArgoCD sync
+
+## Verification
+
+The notification workflow successfully:
+1. Detected the ArgoCD sync failure
+2. Extracted failure details including error message and revision
+3. Triggered GitHub repository_dispatch event
+4. Created GitHub issue #12 with comprehensive failure information
+5. Applied appropriate labels: `argocd-deployment-failure`, `automated`, `bug`
+
+## Conclusion
+
+**Root Cause:** Intentionally malformed `apiVersion` field in test repository  
+**System Status:** ArgoCD notification system is functioning correctly  
+**Recommendation:** If testing is complete, delete the test application. Otherwise, fix the source repository manifest.
+
+---
+
+For complete technical details and remediation options, see `Act-3/ROOT_CAUSE_ANALYSIS.md`.
diff --git a/Act-3/README.md b/Act-3/README.md
new file mode 100644
index 0000000..aadfb8b
--- /dev/null
+++ b/Act-3/README.md
@@ -0,0 +1,119 @@
+# Act 3: ArgoCD Deployment Failure Investigation
+
+This directory contains the investigation results for the ArgoCD deployment failure of the `2-broken-apps` application.
+
+## Quick Links
+
+- 📊 **[Investigation Summary](INVESTIGATION_SUMMARY.md)** - Executive summary of findings
+- 🔍 **[Root Cause Analysis](ROOT_CAUSE_ANALYSIS.md)** - Detailed technical analysis with remediation options
+- 📝 **[How to Post RCA](HOW_TO_POST_RCA.md)** - Instructions for posting the analysis to GitHub issue #12
+
+## Investigation Results
+
+### Root Cause
+Invalid Kubernetes manifest with incomplete `apiVersion` field in the source repository.
+
+- **Location:** `apps/broken-aks-store-all-in-one.yaml` (line 178)
+- **Issue:** `apiVersion: apps/v` (should be `apiVersion: apps/v1`)
+- **Repository:** https://github.com/dcasati/argocd-notification-examples.git
+- **Revision:** `8cd04df204028ff78613a69fdb630625864037c6`
+
+### Conclusion
+This appears to be an **intentional test case** to validate the ArgoCD notification system:
+- ✅ The notification system detected the failure
+- ✅ GitHub issue #12 was automatically created
+- ✅ All error details were properly captured and reported
+
+## Files in This Directory
+
+| File | Description |
+|------|-------------|
+| `INVESTIGATION_SUMMARY.md` | Executive summary of the investigation |
+| `ROOT_CAUSE_ANALYSIS.md` | Complete technical analysis with 4 remediation options |
+| `HOW_TO_POST_RCA.md` | Instructions for posting analysis to GitHub issue |
+| `post-rca-to-issue.sh` | Bash script for automated posting (requires GitHub token) |
+| `argocd-test-app.yaml` | ArgoCD Application manifest (the one causing the issue) |
+
+## Related Files
+
+| File | Description |
+|------|-------------|
+| `../.github/workflows/post-rca-comment.yml` | GitHub Actions workflow for posting RCA to issue |
+| `../.github/workflows/argocd-deployment-failure.yml` | Workflow that creates issues on ArgoCD failures |
+| `../.github/argocd/argocd-notifications-config.yaml` | ArgoCD notification configuration |
+
+## Remediation Options
+
+The `ROOT_CAUSE_ANALYSIS.md` provides four options:
+
+1. **Fix the source repository** (recommended if not a test)
+2. **Use a different revision** (rollback to working commit)
+3. **Use a different source repository** (point to valid repo)
+4. **Delete the application** (if testing is complete)
+
+## How to Use These Files
+
+### To Post the Analysis to GitHub Issue #12
+
+Choose one of these methods:
+
+```bash
+# Option 1: Using GitHub CLI
+gh issue comment 12 --body-file ROOT_CAUSE_ANALYSIS.md
+
+# Option 2: Using the bash script (requires GITHUB_TOKEN)
+export GITHUB_TOKEN="your_token_here"
+./post-rca-to-issue.sh 12
+
+# Option 3: Manual copy/paste
+# Open ROOT_CAUSE_ANALYSIS.md and copy content to GitHub issue #12
+```
+
+### To Fix the Issue
+
+If this is not a test and needs to be fixed:
+
+```bash
+# Clone the source repository
+git clone https://github.com/dcasati/argocd-notification-examples.git
+cd argocd-notification-examples
+
+# Fix the apiVersion
+sed -i 's/apiVersion: apps\/v$/apiVersion: apps\/v1/' apps/broken-aks-store-all-in-one.yaml
+
+# Commit and push
+git add apps/broken-aks-store-all-in-one.yaml
+git commit -m "Fix: Complete apiVersion for order-service Deployment"
+git push origin main
+
+# Trigger ArgoCD sync
+argocd app sync 2-broken-apps
+```
+
+## Background: ArgoCD Notifications
+
+This investigation demonstrates the ArgoCD notification system working correctly:
+
+```
+ArgoCD detects failure
+    ↓
+ArgoCD Notifications sends webhook
+    ↓
+GitHub repository_dispatch
+    ↓
+GitHub Actions creates issue
+    ↓
+GitHub Copilot investigates
+    ↓
+Root cause identified and documented
+```
+
+## Related Issues
+
+- GitHub Issue #12: 🚨 ArgoCD Deployment Failed: 2-broken-apps
+- GitHub Issue #11: 🚨 ArgoCD Deployment Failed: 2-broken-apps (duplicate)
+
+---
+
+**Investigation completed:** 2026-02-03  
+**Investigated by:** GitHub Copilot Agent
diff --git a/Act-3/ROOT_CAUSE_ANALYSIS.md b/Act-3/ROOT_CAUSE_ANALYSIS.md
new file mode 100644
index 0000000..ed6f4cd
--- /dev/null
+++ b/Act-3/ROOT_CAUSE_ANALYSIS.md
@@ -0,0 +1,169 @@
+# Root Cause Analysis: ArgoCD Deployment Failure (2-broken-apps)
+
+**Investigation Date:** 2026-02-03  
+**Issue:** #12 - 🚨 ArgoCD Deployment Failed: 2-broken-apps  
+**Status:** Root Cause Identified
+
+---
+
+## 🔍 Root Cause Analysis
+
+I've investigated the ArgoCD deployment failure for the `2-broken-apps` application and identified the root cause.
+
+### Summary
+The deployment is failing due to an **invalid Kubernetes manifest** in the source repository. Specifically, there is a malformed `apiVersion` field in the `order-service` Deployment manifest.
+
+### Root Cause Details
+
+**Location:** `apps/broken-aks-store-all-in-one.yaml` (lines 178-179)
+
+**Issue:** The `apiVersion` field is incomplete:
+```yaml
+apiVersion: apps/v    # ❌ INVALID - incomplete version
+kind: Deployment
+metadata:
+  name: order-service
+```
+
+**Expected:**
+```yaml
+apiVersion: apps/v1   # ✅ CORRECT
+kind: Deployment
+metadata:
+  name: order-service
+```
+
+### Technical Analysis
+
+1. **Repository:** https://github.com/dcasati/argocd-notification-examples.git
+2. **Broken Commit:** `8cd04df204028ff78613a69fdb630625864037c6`
+3. **Commit Message:** "break apiVersion formatting in deployment YAML"
+4. **Affected Resource:** `order-service` Deployment in `apps/broken-aks-store-all-in-one.yaml`
+
+The error message "one or more synchronization tasks are not valid" is ArgoCD's response to encountering an invalid Kubernetes manifest that cannot be parsed or validated against the Kubernetes API.
+
+### Impact
+
+- **Health Status:** Degraded (as reported)
+- **Sync Status:** OutOfSync (as reported)
+- **Failed Resource:** order-service Deployment
+- **Retry Behavior:** ArgoCD attempted to sync 2 times before giving up (as configured in the retry policy)
+
+---
+
+## 📋 Remediation Recommendations
+
+### Option 1: Fix the Source Repository (Recommended)
+This is the proper long-term fix if you control the source repository:
+
+```bash
+# 1. Clone the source repository
+git clone https://github.com/dcasati/argocd-notification-examples.git
+cd argocd-notification-examples
+
+# 2. Edit the broken manifest
+# Change line 178 from "apiVersion: apps/v" to "apiVersion: apps/v1"
+sed -i 's/apiVersion: apps\/v$/apiVersion: apps\/v1/' apps/broken-aks-store-all-in-one.yaml
+
+# 3. Commit and push the fix
+git add apps/broken-aks-store-all-in-one.yaml
+git commit -m "Fix: Complete apiVersion for order-service Deployment"
+git push origin main
+
+# 4. Trigger ArgoCD sync
+argocd app sync 2-broken-apps
+```
+
+### Option 2: Use a Different Revision
+Point the ArgoCD Application to a working commit (if one exists before the breaking change):
+
+```bash
+# Find a working commit
+git log --oneline apps/broken-aks-store-all-in-one.yaml
+
+# Update the ArgoCD Application to use that revision
+argocd app set 2-broken-apps --revision <working-commit-sha>
+argocd app sync 2-broken-apps
+```
+
+### Option 3: Use a Different Source Repository
+If this repository is intentionally broken for testing, update the ArgoCD Application manifest to point to a working repository:
+
+```bash
+# Edit Act-3/argocd-test-app.yaml
+# Change spec.source.repoURL to a valid repository
+# For example: https://github.com/Azure-Samples/aks-store-demo.git
+# Change spec.source.path to a valid path
+# For example: aks-store-all-in-one.yaml
+```
+
+### Option 4: Delete the Application (If Testing)
+If this was intentionally created to test the ArgoCD notification system and is no longer needed:
+
+```bash
+# Delete the application from ArgoCD
+argocd app delete 2-broken-apps
+
+# Or delete the manifest file
+kubectl delete -f Act-3/argocd-test-app.yaml
+```
+
+---
+
+## 🔐 Additional Observations
+
+Based on the repository structure and commit message, this appears to be an **intentional test case** to validate the ArgoCD notification system. The repository is named "argocd-notification-examples" and the commit explicitly states it's breaking the YAML.
+
+**If this is a test:**
+- ✅ The notification system is working correctly
+- ✅ GitHub Actions workflow successfully created this issue
+- ✅ The error detection and reporting mechanism is functioning as designed
+
+**If this is not a test:**
+- Follow Option 1 above to fix the source repository
+- Verify the fix by running: `kubectl apply --dry-run=server -f apps/broken-aks-store-all-in-one.yaml`
+
+---
+
+## 📊 Verification Steps
+
+After applying any fix, verify the deployment:
+
+```bash
+# 1. Check application status
+argocd app get 2-broken-apps
+
+# 2. Watch for sync completion
+argocd app wait 2-broken-apps --health
+
+# 3. Verify pods are running
+kubectl get pods -n default -l app=order-service
+
+# 4. Check deployment status
+kubectl describe deployment order-service -n default
+```
+
+---
+
+## Investigation Methodology
+
+1. **Examined ArgoCD Application Manifest**
+   - Located at: `Act-3/argocd-test-app.yaml`
+   - Identified source repository and path
+
+2. **Cloned Source Repository**
+   - Repository: https://github.com/dcasati/argocd-notification-examples.git
+   - Analyzed commit history and current state
+
+3. **Identified Broken Manifest**
+   - File: `apps/broken-aks-store-all-in-one.yaml`
+   - Line 178: Malformed `apiVersion: apps/v` (missing the `1`)
+
+4. **Confirmed Root Cause**
+   - The incomplete apiVersion prevents Kubernetes from parsing the manifest
+   - ArgoCD cannot validate or apply the resource
+   - Results in "synchronization tasks are not valid" error
+
+---
+
+**Note:** This root cause analysis was performed by examining the source repository at revision `8cd04df204028ff78613a69fdb630625864037c6` and identifying the malformed `apiVersion` field in the order-service Deployment manifest.
diff --git a/Act-3/post-rca-to-issue.sh b/Act-3/post-rca-to-issue.sh
new file mode 100755
index 0000000..0cbefd8
--- /dev/null
+++ b/Act-3/post-rca-to-issue.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+# Script to post root cause analysis to GitHub issue
+
+set -e
+
+ISSUE_NUMBER="${1:-12}"
+REPO_OWNER="DevExpGbb"
+REPO_NAME="agentic-platform-engineering"
+COMMENT_FILE="Act-3/ROOT_CAUSE_ANALYSIS.md"
+
+echo "Posting root cause analysis to issue #${ISSUE_NUMBER}..."
+
+# Check if GitHub token is available
+if [ -z "${GITHUB_TOKEN}" ] && [ -z "${GH_TOKEN}" ]; then
+    echo "ERROR: No GitHub token found in environment"
+    echo "Please set GITHUB_TOKEN or GH_TOKEN environment variable"
+    echo ""
+    echo "Alternatively, you can manually post the comment from: ${COMMENT_FILE}"
+    echo "Or trigger the workflow: .github/workflows/post-rca-comment.yml"
+    exit 1
+fi
+
+# Use GITHUB_TOKEN if available, otherwise GH_TOKEN
+TOKEN="${GITHUB_TOKEN:-$GH_TOKEN}"
+
+# Read the comment body and create JSON payload
+COMMENT_BODY=$(cat "${COMMENT_FILE}" | jq -Rs .)
+
+# Create the API request
+curl -X POST \
+  -H "Accept: application/vnd.github+json" \
+  -H "Authorization: Bearer ${TOKEN}" \
+  -H "X-GitHub-Api-Version: 2022-11-28" \
+  "https://api.github.com/repos/${REPO_OWNER}/${REPO_NAME}/issues/${ISSUE_NUMBER}/comments" \
+  -d "{\"body\":${COMMENT_BODY}}"
+
+echo ""
+echo "Successfully posted root cause analysis to issue #${ISSUE_NUMBER}"