What was found
LEFT WING BODY OVERHEAT LIGHT ILLUMINATED AFTER NR 2 ENGINE START, WITH APU BLEED SWITCH ON. BITE SHOWS CODE 44 WITH ALARM LIGHT ILLUMINATED. CHECKED AFT CARGO, FOUND FULLY LOADED. UNABLE TO CHECK FOR HOT AREAS. TROUBLESHOT IAW FIM 26-18 TASK 802, AND 815. VERIFIED FAULT CODE 44. CONNECTED OVERHEAT DETECTION MODULE TEST EQUIPMENT AND CHECKED VOLTAGE & RESISTANCE TO THE AFT CARGO SECTION 46 WITH BLEEDS ON & OFF ALL WITHIN LIMITS. OPS APU BLEEDS & LT PACK FOR OVER AN HOUR & CHECKED AFT CARGO BAY FOR BLEED LEAKS, NO DEFECTS NOTED. SUSPECTED EXTREME HOT WEATHER IN PHOENIX TRIGGERED THE FAULT. OPS CHECKED GOOD IAW AMM 26-18-00.