What was found
(CAN) AIR TURNBACK DUE TO AN APU DOOR CAUTION MESSAGE IN FLIGHT, COMPLIED WITH QRH MESSAGE PERSISTED. CORRECTIVE ACTION: APU DOOR ACTUATOR REPLACED AND OPS CHECK GOOD. (TC# 20191002035)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) AIR TURNBACK DUE TO AN APU DOOR CAUTION MESSAGE IN FLIGHT, COMPLIED WITH QRH MESSAGE PERSISTED. CORRECTIVE ACTION: APU DOOR ACTUATOR REPLACED AND OPS CHECK GOOD. (TC# 20191002035)