What was found
JFK - INFLIGHT AIR INTERRUPTED TO JFK DUE TO SMOKE AND ELECTRICAL ODOR IN COCKPIT AND CABIN. LANDED JFK WITHOUT INCIDENT. FOUND CAPTAINS WINDOW HEAT TERMINAL BLOCK ARCHING/BURNING AND STRONG ELECTRICAL ODOR EMANATING FROM IT WHEN WINDOW HEAD WAS SELECTED. REPLACED LEFT ONE WINDOW, HARNESS AND HEAT CONTROLLER. SYSTEM GROUND CHECKED NORMAL OPERATION.