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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width,initial-scale=1" />
+  <title>What to do — 421 4.3.2</title>
+  <link rel="stylesheet" href="../assets/styles.css" />
+</head>
+<body>
+  <div class="container">
+
+    <div class="topbar">
+      <div class="brand">
+        <div class="brand-mark" aria-hidden="true"></div>
+        <div class="brand-title">
+          <strong>What to do</strong>
+          <span>Step-by-step guidance</span>
+        </div>
+      </div>
+      <nav class="nav">
+        <a class="pill" href="../codes/421-4-3-2.html">Back to code</a>
+        <a class="pill" href="../index.html">All codes</a>
+      </nav>
+    </div>
+
+    <section class="hero">
+      <div class="hero-inner">
+        <div>
+          <div class="codechip">
+            <span class="code">421 4.3.2</span>
+            <span class="badge b-temp">Temporary</span>
+          </div>
+          <h1>What to do (step-by-step)</h1>
+          <p class="lead">
+            This page will contain detailed, practical steps for support teams and admins.
+            For now, use the quick guidance on the main code page.
+          </p>
+
+          <!-- HANDOFF NOTE:
+               Create full step-by-step content for 421 4.3.2 in another chat.
+               Include: decision tree (wait vs escalate), common logs to check, common causes,
+               and email template to send to the external sender/recipient when needed.
+          -->
+
+          <div class="cta-row">
+            <a class="btn primary" href="../codes/421-4-3-2.html">Back to explanation</a>
+            <a class="btn" href="../index.html">Choose another code</a>
+          </div>
+
+          <div class="small-note">
+            Placeholder intentionally kept short. Full operational “What to do” will be built code-by-code.
+          </div>
+        </div>
+
+        <aside class="side">
+          <h3>Quick reminder</h3>
+          <ul>
+            <li>Usually resolves with retry</li>
+            <li>Escalate only if persistent</li>
+          </ul>
+        </aside>
+      </div>
+    </section>
+
+  </div>
+</body>
+</html>
