As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PART TIME UK PILOT REPORTED THE CARGO DOOR LIGHT CAME ON AFTER 15 MINUTES OF FLIGHT. AIRCRAFT RETURNED TO POINT OF ORIGIN AND DURING SHUTDOWN THE LIGHT WENT OUT. MAINTENANCE FOUND THE CARGO DOOR MICROSWITCH OUT OF ADJUSTMENT. MICROSWITCH ADJUSTED AND AIRCRAFT RETURNED OT SERVICE.