What was found
W/S HEAT 2 MASTER CAUTION LIGHT ILLUMINATED THEN BURNING SMELL COMING THROUGH COCKPIT. WE SHUT OFF W/S HEAT 2 SMELL DISSAPATED. "TRANSFERRED TO NRWC 688-ORD-04297". C/A-PERFORMED WINDSHIELD TEMP CONTROLLER INSPEDTION IAW AMM 30-42-01-200-801, NO DEFECTS NOTED. INSPECTED WINDSHIELD HEAT CONTACTOR AND FUSE NO DEFECTS NOTED. INSPECTED WINDSHIELD 2 HEAT TERMINAL BLOCK NO DEFECTS NOTED. PERFORMED WINDSHIELD HEATING OPS/FUNCTIONAL CHECKS IAW AMM 30-42-00, OPS CHECK FAIL. REMOVED AND REPLACED WINDSHIELD 2 HEAT CONTROLLER IAW AMM 30-42-01, OPS CHECK FAIL. SWAPPED WINDSHIELD HEAT SENSOR LEADS FROM SPARE SENSOR (S3,S4) TO MAIN SENSOR (S1,S2) IAW AMM 30-42-00-700-801. WINDSHIELD HEAT OPS CHECK GOOD IAW AMM 30-42-00.