What was found
LAX - FLT 1258 - AFTER TAKEOFF, RED NOSE GEAR LIGHT WOULD NOT EXTINGUISH WHEN GEAR HANDLE SELECTED UP. RE-CYCLED GEAR, NO HELP. LOUD NOISE HEARD. RETURNED AND LANDED LAX WITHOUT INCIDENT. REPLACED NOSE GEAR UP POSITION PROXIMITY SWITCH. ACCOMPLISHED GEAR SWING, SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)