What was found
FLT 6281 - IAD-HPN - AFTER TAKEOFF, THE CREW EXPERIENCED A DISCREPANCY WITH THE NOSE GEAR INDICATING DOWN AND LOCKED AFTER THE GEAR HANDLE WAS SELECTED TO 'UP'. AIRCRAFT RETURNED TO IAD WHERE MAINTENANCE WAS DISPATCHED. MAINTENANCE CLEANED AND INSPECTED UPLOCK MICROSWITCH, PERFORMED SEVERAL GEAR SWINGS BUT COULD NOT DUPLICATE THE DISCREPANCY. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE (M)