As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PUSH BACK APU QUIT RETURNED TO GATE APU AUTO SHUTDOWN. IAW QRH SWITCH OFF TO ON. FAULT LIGHT EXTINGUISHED. APU STARTED NORMALLY. ECB BITE SHOWS NO FAULTS. APU STARTED TWICE SUCCESSFULLY AND RUNNING WITH LOADS NORMALLY. ETOPS CATEGORY 'E': PROBLEMS WITH SYSTEMS CRITICAL TO ETOPS.