As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU INFLIGHT SHUTDOWN WHILE ENROUTE. SINGLE GENERATOR. VERIFIED APU INTAKE DOOR CLOSED AND ALL MX ACTION HAS BEEN COMPLIED WITH. REACTIVATED APU PER MEL 49-10-1A TROUBLESHOT APU INFLIGHT SHUTDOWN IAW FIM 49-10-00. REMOVED AND REPLACED APU ECU IAW AMM 49-61-01. OPS CHECK GOOD AT THIS TIME. PLACARDS REMOVED DMI CLEARED.