What was found
SMELLED ELECTRICAL FROM FLIGHT DECK, AND VISIBLE SMOKE IN THE CABIN. THE L WINDSHIELD HEAT DIDN`T TURN OFF AFTER SELECTED OFF. PERFORMED FIM TASK, SMOKE AND/OR ABNORMAL SMELL IN PASSENGER CABIN. REMOVED AND REPLACED LT ENGINE STAGE 4 SHUT-OFF VALVE WITH A SERVICEABLE UNIT PER TASK, PERFORMED MULTIPLE ENGINE START SEQUENCES IAW AMM AND PERFORMED OIL CONSUMPTION CHECK IAW AMM, NO SMOKE IN THE CABIN NOTED AT THIS TIME AND LT ENGINE DID NOT CONSUME ANY OIL DURING THE MULTIPLE ENGINE OPERATION SEQUENCES, NO ENGINE OIL LEAKS FOUND AT THIS TIME ALL OPS CHECKS GOOD, AIRCRAFT GOOD FOR SERVICE.