What was found
FLT 6563 - IAD-RDU - DURING TAKEOFF, EXPERIENCED A DISCREPANCY WITH THE RED GEAR INTRANSIT LIGHT ILLUMINATION ON GEAR UP ACTIVATION. GEAR WAS CYCLED DOWN AND HAD THREE GREEN LIGHTS. AIRCRAFT RETURNED TO IAD WHERE MAINTENANCE WAS DISPATCHED AND FOUND THAT THE FILAMENT TEST RELAY HAD FAILED. MAINTENANCE REMOVED AND REPLACED THE TEST RELAY AND PERFORMED THE REQUIRE CHECKS. AIRCRAFT WAS THEN RELEASED FOR SERVICE. (M)