What was found
MSP - DURING CLIMBOUT, LANDING GEAR DOOR OPEN LIGHT REMAINED ON AFTER GEAR WAS RETRACTED. CONTINUED FLIGHT TO SMF AND UTILIZED EMERGENCY GEAR EXTENSION PROCEDURES FOR LANDING. RIGHT GEAR DOOR WAS DAMAGED DURING LANDING ROLL AND FOUND LEFT MAIN GEAR DOOR SENSOR FASTENER MISSING. INSTALLED FASTENER, REPLACED RIGHT MAIN GEAR DOOR AND LEFT MAIN GEAR DOOR SKID PLATE. OPERATIONAL CHECK OK AND AIRCRAFT RETURNED TO SERVICE.