As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU GENERATOR INOPERATIVE. REPLACED APU GCU, NO HELP. ACTIVE MESSAGE ELECTRICAL GENERATOR OFF APU. MAINT MESSAGE 24-31713. FOUND TERMINAL END AT GENERATOR SIDE IS BROKEN. WIRING NR IS W7860-0002-3 (T2 WIRE LEAD). REPLACED APU FEEDER CABLES (T1,T2,T3 AND N) AND APU GENERATOR TERMINAL BLOCK. APU GENERATOR OPERATION CK'D OK.