As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DEPARTED AND AFTER TAKEOFF, ATC INFORMED THE PILOT THAT THE AFT POD CARGO DOOR WAS OPEN. THE AIRCRAFT RETURNED AND THE PILOT IN COMMAND INSPECTED THE DOOR, HINGES AND AND THE POD AND FOUND NO DAMAGE. THE AIRCRAFT DEPARTED AND MAINTENANCE INSPECTED THE DOOR AND FOUND THE DOOR SERVICEABLE. FOUND THE AFT LATCH SPRING WEAK AND REPLACED SPRING AS A PRECAUTION.