What was found
DURING APPROACH UPON LANDING GEAR EXTENSION, NOSE GEAR SAFE (GREEN) INDICATION DID NOT ILLUMINATE WHILE UNSAFE (RED) INDICATION REMAINED ILLUMINATED. CREW RECYCLED LANDING GEAR TO NO AVAIL. VERIFIED NOSE LANDING GEAR WAS DOWN AND LOCKED THROUGH VIEWING PORT AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NOSE GEAR POSITION SWITCH. OPERATIONAL CHECK WAS NORMAL.