What was found
WHILE LOADING CUSTOMER BAGS INTO THE AFT BAGGAGE COMPARTMENT, LINE CREW NOTED SMOKE AND AN ODOR COMING FROM THE AFT MAINTENANCE COMPARTMENT. FLIGHT CREW TURNED OFF VAPOR CYCLE COOLING SYSTEM AND CALLED MAINTENANCE. LOCAL MAINTENANCE WAS CALLED AND THEY CONFIRMED THAT THE SMELL WAS COMING FROM THE A/C MOTOR. THE MOTOR WAS ALSO WARM TO THE TOUCH. VAPOR CYCLE COOLING SYSTEM CIRCUIT BREAKER WAS PULLED AND COLLARED. THE SYSTEM WAS DEFERRED, IAW RED WING AEROPLANE COMPANY'S FLEET MEL.