I get “Class not found” after a module update, can you fix that?

Yes. Class 'AdminSomethingController' not found after a module update is almost always a half-deployed module, a stale class index, or a namespace mismatch. We finish or roll back the deploy, rebuild var/cache/prod/class_index.php, regenerate the cache, and confirm the back office and the module’s controllers load. If the module itself is broken, we patch it or pin a known-good version.