What was found
LAS/ELP - FLT 976 - AIR TURNBACK; ON TAKEOFF ROLL, CREW NOTED A MINOR ODOR. AFTER TAKEOFF AND ON WHEELS UP, SMOKE FILLED THE COCKPIT, SUBSIDING ON FINAL APPROACH. MAINTENANCE FOUND A BURNED WIRE ON THE NOSE TAXI LIGHT SWITCH. REPLACED THE WIRE. FUNCTIONAL AND OPS CHECK ON LIGHT GOOD. AIRCRAFT RETURNED TO SERVICE. (X)