As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED APU DOOR STATUS MESSAGE DURING TAXI OUT. CYCLED APU MASTER SWITCH, MESSAGE REMAINS. ACCOMPLISHED BITE CHECK OF CONTROLLER, NO MESSAGES, CLEANED CONNECTOR ON APU DOOR ACTUATOR. ACCOMPLISHED THREE APU STARTS. NO MESSAGE FOUND, OPS CHECKED GOOD.