What was found
CREW OBSERVED A STRONG ELECTRICAL INSULATION ODOR COMING FROM THE MAP AND APPROACH LIGHT CONTROL SWITCHES DURING FLIGHT. THE WIRE LEADING TO R-1 WINDOW WAS ALSO HOT. THE CIRCUIT BREAKERS WERE PULLED AND THE ODOR CEASED. MAINTENANCE CHECKED BOTH MAP AND APPROACH LIGHT CONTROLS AND NO DEFECTS WERE FOUND. MAINTENANCE FOUND THE R-1 WINDOW HEAT CONTROL AT FAULT. OPERATION OF THE R-1 WINDOW HEAT CHECKED GOOD IAW MM 30-41-04. MAINTENANCE ALSO FOUND A BAD TERMINAL ON CONTACT A OF WINDOW. THE TERMINAL WAS REPLACED.