What was found
CLIMBING THROUGH FL 320 RECEIVED CABIN PRESS ADVISORY. ATTEMPTED TO SLOW CABIN ALTITUDE BUT OBSERVED FWD OUTFLOW VALVE OPEN HALFWAY. ATTEMPTED CYCLING BETWEEN REG 1 AND 2 TO TRY AND GET PRESS SYSTEM TO RESPOND. SLOWED A/C CLIMB AND RECEIVED CABIN ALTITUDE ABV 10K. FOLLOWED CHECKLIST PROCEDURES AND DIVERTED TO KELP. REMOVED ACCESS PANEL IN LWR FWD CARGO PIT TO ACCESS FWD OUTFLOW VALVE. ON INSPECTION FOUND SMALL AMOUNT OF ADJACENT INSULATION BLANKET IN VALVE AND DAMAGE TO VALVES DEBRIS SCREEN. VALVE AND SCREEN ON ORDER. PART NIS ELP. REMOVED AND REPLACED FORWARD OUTFLOW CONTROL VALVE REF 21-31-12-4, OPS CK GOOD.