As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED APU COLD SOAK START, DID NOT START. APU FAULT EICAS APPEARED. LP 696503, ITEM 1: ITEM TRANSFERRED DO DMI MDDR 64015, PLACARD INSTALLED. APU INOPERATIVE ER OPERATIONS NOT ALLOWED. T/S ECU- IGN UNIT FAULTY. ITEM M3: R & R EXCITER BOX IAW 49-41-03. OPS CHECK GOOD. THIS ITEM IS NOW CLOSED. PLACARD REMOVED, MAINTENANCE NOTIFIED.