guys pls help developer here, but WordPress isnt my daily thing. A clients site broke after an overnight auto-update:

There has been a critical error on this website.
Learn more about troubleshooting WordPress.
The classic critical error page. Their setup has around twenty plugins including a forms plugin. I wanna find teh exact cause instead of randomly deactivating thigns and hoping. Whats teh fastest way to see the real PHP error?? Happy to post logs or teh plugin list if that helps narrow it down. thx in advance!!
