What was found
CREW REPORTED, AFTER TAKEOFF, GEAR IN OFF POSITION, GEAR DOOR LIGHT ILLUMINATED, GEAR CYCLED LIGHT REMAINED ON, CONTACTED MAINTENANCE. REMAINDER OF FLIGHT FLOWN WITH GEAR HANDLE UP, LIGHT GIBSON WAS OFF. FOUND BUSHING, RT MAIN LANDING DOOR SWITCH MECHANISM MISSING. INSTALLED SAME PER 727-MM 32-62-11.