As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, APU HAD AUTO SHUTDOWN, FAULT LIGHT ILLUMINATED AND EICAS MSG APU FAULT DISPLAYED. TROUBLESHOT PER FIM 49-11-00 FIG 110. FOUND BAD OIL COOLER BYPASS VALVE. REMOVED AND REPLACED VALVE PER AMM 49-27-10, OPS AND LEAK CKS GOOD.