What was found
DURING FLIGHT, LANDING GEAR DOOR NOT LATCHED LIGHT STAYED ILLUMINATED IN FLIGHT. UPLATCH CHECK OKAY. CREW CYCLED GEAR AND LIGHT FAILED TO EXTINGUISH. INSPECTION IS ON GOING, AS MORE INFORMATION BECOMES AVAILABLE IT WILL BE PROVIDED. MAINTENANCE PERFORMED A GEAR UP ENGAGEMENT FUNCTIONAL TEST IN ACCORDANCE WITH ATI MEL SPECIAL PROCEDURE 32.8, OPERATIONAL CHECK GOOD. MULTIPLE EXTENSIONS AND RETRACTIONS WERE PERFORMED ALONG WITH A GEAR POSITION INDICATING AND WARNING SYSTEM TEST. OPERATIONAL CHECKS WERE GOOD IN ACCORDANCE WITH THE DOUGLAS AIRCRAFT MAINTENANCE MANUAL AND AIRCRAFT WAS RETURNED TO SERVICE.