diff --git a/ops/browser_diag_v1771.mjs b/ops/browser_diag_v1771.mjs
new file mode 100644
index 0000000..5fa0ca4
--- /dev/null
+++ b/ops/browser_diag_v1771.mjs
@@ -0,0 +1,22 @@
+import { chromium } from 'playwright';
+const browser=await chromium.launch({headless:true});
+const page=await browser.newPage();
+const events=[];
+page.on('console',m=>events.push({type:'console',level:m.type(),text:m.text()}));
+page.on('pageerror',e=>events.push({type:'pageerror',text:String(e)}));
+page.on('requestfailed',r=>events.push({type:'requestfailed',url:r.url(),failure:r.failure()}));
+page.on('response',r=>{if(/performance|data-layer-v1771|server-automation/.test(r.url()))events.push({type:'response',url:r.url(),status:r.status()})});
+await page.goto('http://127.0.0.1:4173/index.html',{waitUntil:'domcontentloaded'});
+await page.waitForTimeout(1500);
+const state=await page.evaluate(async()=>({
+  readyState:document.readyState,
+  performanceLoaded:Boolean(window.SunPerformance),
+  data1771:Boolean(window.CateriumDataV1771),
+  data1770:Boolean(window.CateriumDataV1770),
+  dataCurrent:Boolean(window.CateriumData),
+  perfScript:document.querySelector('script[src*="core/performance.js"]')?.src||null,
+  dataScript:document.getElementById('cateriumDataV1771Script')?.src||null,
+  dataFetch:await fetch('core/data-layer-v1771.js').then(async r=>({status:r.status,ok:r.ok,head:(await r.text()).slice(0,80)})).catch(e=>({error:String(e)}))
+}));
+console.log(JSON.stringify({state,events},null,2));
+await browser.close();