As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU GENERATOR FIELD OFF LIGHT ILLUMINATED. WILL NOT RESET. BPCU BIT FOR APU SHOWS GENERATOR TRIPPED REPLACED GENERATOR DIODE. APU GENERATOR WILL NOT TAKE LOAD AND SHOWS NO FREQUENCIES AND VOLTS. REPLACED APU GENERATOR. RAN APU AND LOADED GENERATOR. GENERATOR OPS CHECKED GOOD.