As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT FAILED TO START FIRST ATTEMPT. ACCMP'D BITE ON ECU, HAD ABORTED START. STARTER CIRCUIT FAULT. CREW STARTED APU ON SECOND TRY. START CONTACTOR, E-STARTER, START RELAY, ECU AND APU BAT CHRGR HAS BEEN REPLACED. HISTORY INDICATES THAT APU ESN 60227 WAS REMOVED FROM ACFT 5439 FOR SAME CHRONIC REASON & PASSED TEST CELL DIAG. HOWEVER PREVIOUS VISIT HAD IGV LINKAGE PROB. REPLACE APU. REPLACED APU PER TOD MM, OPS CHECK AND LEAK CHECK OKAY.