What was found
RT HAND DUCT OVERTEMP ILLUMINATED AFTER TAKEOFF. RT BLEED AUTOMATICALLY CLOSED. FLIGHT ATTENDANT REPORTED SEEING SMOKE AND EXTREME HEAT IN THE CABIN. RETURNED TO LAND AT MEMPHIS AFTER DECLARING EMERGENCY. CND RT DUCT OVERTEMP. FOUND FLIGHT DECK TEMP SENSOR BLOWER INOP AND CABIN AUTO TEMP INOP. R&R CABIN AUTO TEMP CONTROLLER AND F DECK TEMP SENSOR. ALL CHECKS GOOD IAW SF340 AMM CHP. 21-60-00-05. TEMP SENSOR P/N ON & OFF BYLF51175 IAW 21-61-15-04. TEMP CONTROLLER P/N ON & OFF 754661-8, S/N ON 98022638, S/N OFF 96121815.