What was found
DURING CLIMB, LOST CABIN PRESSURE AT 17,000 FEET, FLIGHT RETURNED. FOUND INSULATION BLANKET UNDER LEFT OUTFLOW VALVE. REMOVED INSULATION BLANKET AND REMOVED AND REPLACED LEFT OUTFLOW VALVE, MFG P/N 103280-5-1. ALSO, REMOVED AND REPLACED RIGHT OUTFLOW VALVE, MFG P/N 103280-5-1, AUTOMATIC CABIN PRESSURE CONTROL, MFG P/N 102518-3-1 AND MANUAL PRESSURE CONTROLLER, MFG P/N 131046-1. PERFORMED CABIN PRESSURE LEAK CHECK, CHECKED NORMAL.