What was found
FLIGHT ATTENDANTS REPORTED TO A BURNING ELECTRICAL ODOR AND SMOKE IN THE REAR OF THE CABIN. CABIN TEMP GAUGE EXCEEDED 150'F. FLIGHT DECK CREW ELECTED TO RETURN TO TYS. THE AIRCRAFT WAS INSPECTED BY MAINTENANCE DEPARTMENT PERSONNEL, TROUBLESHOOTING DETERMINED THE RECIRCULATION FAN WAS INOPERATIVE AND THE FAN WAS REPLACED. AN OPERATIONAL CHECK WAS PERFORMED AND THE SYSTEM CHECKED NORMAL. THE AIRCRAFT WAS RETURNED TO SERVICE.