As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WOULD NOT START. FAULT LIGHT ILLUMINATED EGT 780, RPM 17. SECOND ATTEMPT SAME RESULT. PERFORMED APU ECU BITE TEST AND FOUND MINI FLAG 02. REMOVED AND REPLACED APU ECU IAW AMM 49-61-05. PERFORMED AN ECU BITE TEST IAW FIM 49-11-00, NO FAULTS NOTED AND APU STARTED ON FIRST ATTEMPT.