As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT START 2 ATTEMPTS(<P>REMOVED AND REPLACED ECU DUE TO HARD FAULT ECU. OPS CHECK GOOD. REF: AMM 49-61-05. S/N OFF - 53-1057. P/N OFF - 2117342-20. REMOVED AND REPLACED APU AIR INTAKE ACTUATOR DUE TO APU ECU HARD FAULT. OPS CHECK GOOD. REF: AMM 49-15-06.</P>)