It's not near the APU panel, but I'm going to assume you misidentified that panel rather than the external power/nose door panel, that's at the front right of the aircraft.
It's 3A for the nose door, which is powered by AC BUS 2, usually from the APU generator.
3 removed in the nose wheel bay, confirm?
If all sounds correct above, maybe you can post some screenshots of the AC and DC electrical. and hydraulic synoptic pages?