As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN FLIGHT FROM DRO TO DEN, CREW REPORTED FUSELAGE PRESSURE DROP AT 11,500 FEET AND CARGO DOOR SHOWED OPEN. CREW DID NOT DECLARE AN EMERGENCY AND RETURNED TO DRO WITHOUT INCIDENT. MAINTENANCE FOUND CARGO DOOR HANDLE NOT LATCHED. MAINTENANCE LATCHED AND SECURED PER BOMBA AMM AND OPS CHECKED GOOD.