What was found
AIRCRAFT WOULDN'T HOLD CABIN PRESSURE. CABIN WARNING VOICE FLOW LIGHT ON. LEFT VALVE TEMP FULL HOT (AUTO) REDUCED TEMP BOTH PACKS LEFT PACK ON 30 SEC FLOW LIGHT ON MASK DROPPED. MANUAL MODE ON OUTFLOW VALVE. PERFORMED TEST ON TEMP CONTROLLER SYSTEM WITH TEST BOX. CONFIRMED LEFT CONTROLLER TO BE BAD. REMVOED AND REPLACED TEMP CONTROLLER. OPS CHECKS GOOD. PERFORMED LEAK CHECK OF DUCTING AND PRESSURIZATION CHECK. FOUND NO OTHER DEFECTS NOTED AT THIS TIME. (M)