As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SQUEALING NOISES FROM THE AREA OF THE COMMUNICATION DOOR WERE NOTED BY THE CREW AFTER TAKEOFF. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED FOR INSPECTION. MAINTENANCE INSPECTED AND RE-SECURED THE COMMUNICATION DOOR SEAL, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 53-00-00. OPERATIONAL CHECKS WERE COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.