Separate doorbell power, local Wi-Fi, internet, router or mesh, vendor service, app/account, notification, recording, two-way audio, and indoor-chime symptoms before recommending a reset or replacement.
Check the approved doorway and network path, reconnect supported equipment through the manufacturer's current process, and let the customer enter passwords, MFA, recovery details, and setup codes directly.
Test the customer's real everyday path: button press, phone alert, live view, approved two-way audio, indoor or smart-speaker announcement, and a non-sensitive sample event when the owner permits it.
Provide a service summary covering what was observed, what changed with approval, what remains unconfirmed, and whether Wi-Fi work, vendor support, electrical/chime work, mounting, replacement, or a larger quote is next.