What was found
FLT 2708 - MEM-SLC - DURING CLIMB-OUT, THE LOWER BODY AFT OVER HEAT LIGHT WAS ILLUMINATED. THE AIRCRAFT CONTINUED TO SLC AND MADE A NORMAL ROUTINE LANDING. MAINTENANCE REPLACED THE FIRE AND OVERHEAT DETECTION UNIT. CARRIED OUT ENGINE RUN ON BOTH NR 1 AND NR 2 ENGINES. BOTH AIR CONDITIONING PACKS CHECK NORMAL. LOWER BODY AFT OVERHEAT, NO LEAK FOUND. AIRCRAFT WAS THEN RETURNED TO SERVICE. (M)