What was found
IN CRUISE FLIGHT, CREW RECOGNIZED SMOKE FROM DC BUSS PANEL. THE CREW REPORTED NO CIRCUIT BREAKERS OR SWITCH BREAKERS WERE TRIPPED. DURING ISOLATION OF ELECTRICAL SYSTEMS, NO MORE SMOKE WAS NOTED. THE CREW ELECTED TO DIVERT TO KSLK AS A PRECAUTION AND LANDED WITHOUT INCIDENT. COMPANY MAINTENANCE IDENTIFIED THE DROPPING RESISTOR WITHIN THE CABIN HEATER VENTILATING FAN CIRCUIT TO BE BURNED. THE RESISTOR IS MOUNTED WITHIN THE DC BUSS PANEL. THE RESISTOR, CABIN VENTILATING FAN HI/LOW SWITCH, AND CABIN VENTILATING FAN WERE REPLACED.