As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM - FRM CODE 4911XA00 AFTER LANDING UNABLE TO START APU NO RPM RISE. NO OTHER FAULT INDICATIONS. ECU FAULT SHOWS ECU AND MINI FLAGS 30-32-39-48-55-105. REPLACED ECU PER TASK 49-61-05-404-008. STARTED BOTH ENGINES AND RAN PACKS AND ELECTRICAL LOAD FOR SEVERAL MINUTES. NO FAULTS, OK FOR SERVICE.