As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - APU FAILED TO START (2X) APU FAULT. APU ECU BITE CK SHOWS "FIRE EMERG" & "REV FLOW" FAULTS WIRING CKS GOOD FROM RELAY K421 TO SHUTDOWN SW S484 REPL K421 FOR PRECAUTION IAW FIM 49-11-00, FIG 103. R & R SURGE CONTROL VALVE IAW AMM 49-53-01 OPER CK GOOD R & R INLET TEMP SENSOR IAW AM 49-61-03 ALL OPS CKS GOOD.