As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON LANDING AT GSO, IT WAS FOUND THAT THE APU ACCESS DOOR HAD OPENED IN FLIGHT. MAINTENANCE WAS SENT TO GSO AND REPLACED THE APU TAIL CONE ASSMEBLY IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 53-00-00. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.