As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO DOOR SHOWED OPEN IN FLIGHT. ALSO REPORTED PRESSURIZATION ISSUES. AN EMERGENCY WAS NOT DECLARED, ELECTED TO RETURN AND LANDED WITHOUT INCIDENT. PERFORMED OPS CHECK OF THE CARGO DOOR IAW AMM AND NO DEFECTS WERE NOTED. MAINTENANCE SUSPECTS HANDLE WAS NOT LATCHED PROPERLY PRIOR TO DEPARTURE. ACFT IS GOOD FOR SERVICE.