Did you watch the IO’s when someone pushed the hall buttons? And if you force the outputs on does it fire the hall button lights?
I feel like it’s a parameter issue. If your fire code parameter changed after the power blip then something else did. There are a few items I’d check but too many to list completely 😂.
M-1-3-1-9 RISER
M-1-3-1-2 TOP
M-1-3-1-7 EN-HCR
M-1-3-3-1 (Verify the CUDE masks for each landing)
Hall button IO’s 1848, 1849, 1928,1929 etc.
Fire a hall call via the service tool and see if the car responds.