As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, THE CREW REPORTED THE CARGO DOOR WAS INDICATING OPEN. THE CREW CONSULTED WITH MAINTENANCE AND MADE AN AIR-TURN-BACK TO DEPARTURE. WHEN THIS BEING A RETURN PROBLEM, MAINTENANCE CHECKED THE GAP OF THE DOOR SENSORS AND REPLACED LT SIDE AFT 2 INTERIOR FLORESCENT BULBS. A MAINTENANCE FLIGHT WAS PERFORMED WITH DEFECTS NOTES AND THE AC WAS RETURNED TO SERVICE. (K)