What was found
FLT DECK AUTO TEMP CONTROLLER DOES NOT CONTROL TEMP. OVERHEATS, FLEW WITH TRIM AIR OFF. ACCOMPLISHED SERVICE TIP 21-61-00. NO FAULTS NOTED ON ZONE TEMP CONTROLLER BITE TEST. CLEANED TEMP SENSOR. OPS CHECKED NORMAL. PROBLEM RECURRED. UNABLE TO CONTROL COCKPIT TEMP. TEMP FULL COLD, TEMP 96. AUTO MODE AND STBY MODE OF LEFT PACK CREATED DUCT TEMP OVER 120 DEG WITH TEMP SET TO FULL COLD. F-D TRIM AIR VALVE INDICATED CLOSED ON ECS PAGE. SELECTED LEFT PACK OFF, WITH RT PACK ON DUCT TEMP DECREASED. LEFT PACK CONTROLLER NOT TESTING. LEFT PACK INOPERATIVE PER MEL. PERFORMED BITE TEST ON BOTH PACK CONTROLLERS, NO FAULTS FOUND. OPERATED PACKS, BOTH SYSTEMS NORMAL. TRIM VALVES MATCHED TEMP SELECTIONS.