As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU GENERATOR INOPERATIVE. ACFT GROUNDED. R & R APU GCU REF AMM 24-21-81-000-801 AND 24-21-81-400-801. ACCOMPLISHED APU GENERATOR CONTROL UNIT BITE PROCEDURE, OPS CK GOOD, NO DEFECTS NOTED REF FIM 24-21, TASK 801. GROUND VERIFICATION CHECK GOOD. RAN APU WITH FULL ELECTRICAL LOAD, NO DEFECTS NOTED.