What was found
RETURN TO RENO, TAIL COMPT TEMP HI LIGHT CAME ON FOR 2 MINUTES AFTER TAKEOFF. OPERATING WITH LEFT THROTTLE RETARDED FOR 2 MINUTES, LIGHT WENT OUT. RESTORED THROTTLE AND TURNED LT PACK OFF. LIGHT CAME ON, THEN WENT OUT. PERFORMED MAINTENANCE ENGINE RUN PER MM 36-10-00, MODE 1, WITH LT PACK DISCONNECT FOR 5 MINUTES. RECONNECTED LT PACK, RAN FOR 5 MINUTES AT HIGH POWER. DID NOT GET LIGHT AT ANYTIME. SUSPECT WHEN PILOT WANTED GROUND START CART HOOKED UP TO AUGMENT APU AIR TO COOL A/C THAT IT OVERTEMPED TAIL COMPARTMENT. (M)