What was found
AT PUSHBACK THE LEFT WING BODY HEAT OVERHEAT LIGHT CAME ON. BOTH PACKS ON ISOLATION VALVE OPEN. ALL ANTI ICE SWITCHES OFF. GROUNDED - YES. PERFORMED B737-900 FIM 26-18 TASK 801. FOUND ALARM CODE 24 FOR LH A/C BAY. FOUND DUCT CLAMP LOOSE CAUSING HOT AIR ON INBD SENSOR. TIGHTENED CLAMP & CLEANED SENSOR. RAN APU & PACKS. REINTERROGATED DETECTION MODULE & FOUND FAULT CODE 24 CLEARED AND NO MAINT LIGHT. TRACKED A/C HISTORY & FOUND NO HISTORY FOR THIS MAINT MESSAGE LH WING /BODY OVRHT LIGHT. OK FOR SERVICE.