As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU SHUTDOWN ON SECOND ENGINE START ATTEMPT. APU FAULT LIGHT DISPLAYED. FOUND APU SURGE VALVE DUCT BOOT WITH HOLE. PERFORMED BITE ON APU ECU FAULTED REVERSE FLOW. REPLACED SURGE VALVE AND RUBBER BOOT. APU CHECKS NORMAL. ETOPS CATEGORY 'E': PROBLEMS WITH SYSTEMS CRITICAL TO ETOPS.