As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, FAULT LIGHT ILLUM AND EICAS MSG APU FAULT DISPLAYED SECOND ATTEMPT INDICATES HUNG START. ACCOMPLISHED APU ECU BITE. NO FAULTS NOTED. REMOVED AND REPLACED APU ECU PER AMM 49-61-05. STARTED APU SEVERAL TIMES ON GROUND. APU ECU NO FAULTS NOTED APU OIL GOOD. OK FOR SERVICE.