What was found
CMH - FL 1101, AFTER TAKEOFF FROM FWA AND GEAR RETRACTION, LEFT MAIN GEAR UNSAFE LIGHT REMAINED ILLUMINATED. ABNORMAL PROCEDURES COMPLIED WITH, INDICATIONS SHOWED AND UNLOCKED DOOR. GEAR WAS SELECTED DOWN AND FLIGHT DIVERTED TO CMH. AFTER LANDING AND ENGINE SHUTDOWN, LEFT MAIN GEAR DOOR OPENED AND RESTED ON THE GROUND. MAINTENANCE REPLACED THE LEFT MAIN GEAR DOOR ACTUATOR. (M)