As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE -AFT CARGO DOOR- CAUTION MESSAGE ILLUMINATED. THE FLIGHT RETURNED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE DOOR HANDLE POPPED OUT. THE DOOR WAS INSPECTED AND OPERATIONALLY CHECKED. NO DEFECTS WERE FOUND. THE HANDLE WAS PROPERLY SECURED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.