As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU QUIT INFLIGHT WITH APU FAULT LIGHT. NR 2 IDG WAS ON MCO/PLAC AS INOPERATIVE, RETURNED TO ATL. APU EEC FAULTS APU INLET DOOR. REPLACED DOOR ACTUATOR, NO HELP. MANUALLY OPENED DOOR AND RESEATED CANNON PLUG. APU START AND OPERATION NORMAL. NR 2 IDG CONTROL PANEL WAS REPLACED, OPERATION NORMAL.