What was found
DURING AN EVENT, NR 2 INSPECTION OF THE EMERGENCY PRESSURIZATION SYSTEM, VALVE ASSY (BY-PASS) P/N 73318-00-1) WAS REMOVED FROM RT WING ROOT AREA, FURTHER INSPECTION FOUND EXTENSIVE CORROSION IN THIS VALVE AND REDUCER P/N: 584-124 (A55-16-12). SYSTEM CLEANED. BENCH TESTED VALVE, FOUND U/S. SUSPECT MOISTURE RESTING IN VALVE AND REDUCER OVER A LONG PERIOD OF TIME CAUSED VALVE FAILURE.