What was found
DFW - FLT NR 1902 - DURING DESCENT INTO DFW, ELECTRICAL BURNING SMELL NOTED IN COCKPIT. NO OTHER ABNORMAL INDICATIONS AND AIRCRAFT LANDED DFW WITHOUT INCIDENT. CHECK OF COCKPIT WIRING DETERMINED LEFT RUNWAY TURNOFF LIGHT SWITCH FAILED. PULLED AND COLLARED ASSOCIATED CIRCUIT BREAKER AND DEFERRED LEFT RUNWAY TURNOFF LIGHT. SUBSEQUENTLY REPLACED LEFT RUNWAY TURNOFF LIGHT SWITCH AT DTW/28. REACTIVATED SYSTEM AND SYSTEM GROUND CHECKED NORMAL OPERATION. (W)