What was found
DURING APPROACH INTO BWI, NOSE GEAR GREEN LIGHT DID NOT ILLUMINATE ON GEAR EXTENSION. ALSO, RED UNSAFE LIGHT WAS INOPERATIVE. PERFORMED GO-AROUND AND TOWER VISUALLY CONFIRMED THAT GEAR WAS EXTENDED. REQUESTED EMERGENCY EQUIPMENT ON STANDBY. AIRCRAFT LANDED WITHOUT INCIDENT. REPLACED WIRE FROM S1-90 PIN 5 TO GROUND STUD 385 ROUTED OUTSIDE OF CONDUIT. AIRCRAFT RETURNED TO SERVICE.