diff --git a/.github/workflows/browser-diag-v1771.yml b/.github/workflows/browser-diag-v1771.yml
new file mode 100644
index 0000000..6732873
--- /dev/null
+++ b/.github/workflows/browser-diag-v1771.yml
@@ -0,0 +1,33 @@
+name: Caterium v17.7.1 browser diagnostic
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '.github/workflows/browser-diag-v1771.yml'
+permissions:
+  contents: write
+jobs:
+  diagnose:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - run: npm install
+      - run: npx playwright install --with-deps chromium
+      - name: Diagnose browser module loading
+        run: |
+          npx http-server public -p 4173 -c-1 > /tmp/caterium-http.log 2>&1 &
+          sleep 2
+          node ops/browser_diag_v1771.mjs > ops/browser-diag-v1771.txt
+      - name: Commit diagnostic result
+        run: |
+          rm -f .github/workflows/browser-diag-v1771.yml ops/browser_diag_v1771.mjs ops/e2e-v1771.txt
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add -A
+          git add -f ops/browser-diag-v1771.txt
+          git commit -m "Capture v17.7.1 browser module diagnostics"
+          git push