As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SDQ - CREW REPORTED AIRCRAFT VIBRATIONS AFTER TAKEOFF THAT THEY WERE UNABLE TO IDENTIFY. FLIGHT RETURNED TO SDQ WITHOUT INCIDENT. FOUND RIGHT AIR CYCLE MACHINE ACCESS DOOR OPEN AND TWO LATCHES BROKEN ALONG WITH CRACKS ON THE LATCH SIDE OF DOOR. DUE TO CRACKS IN THE DOOR THE ACCESS DOOR WAS REPLACED. SYSTEM GROUND CHECKED NORMAL OPERATION.