What was found
FLT DIVERTED, DURING TAKEOFF AT 110 KNOTS RECEIVED VENT SKIN VLV FAULT MESSAGE, FOLLOWED BY UNABLE TO PRESSURIZE AIRCRAFT DURING CLIMB, DIVERTED TO LAX. REPLACED THE SKIN AIR OUTLET VLV IAW AMM & THE SKIN AIR INLET VLV IAW AMM 21-26-52-000-001-A. REPLACED THE 19HQ & 30HQ BLOWER FAN PRESSURE SWITCHES IAW AMM ALONG WITH THE FILTER ASSEMBLY IAW AMM, OPERATIONS CHECKED OK.