What was found
RETURNING TO FIELD DUE TO UNABLE TO PRESSURIZE. SKIN VLV FAULT. ALSO REF DF96 SKIN EXCH INLET BYPASS VLV CURRENTLY ON MEL. PFR SHOWS SEVERAL FAULTS VENT AVNCS SYS FAULT, VENT SKIN VLV FAULT & VENT BLOWER FAULT. CFDS MSGS, INLET BYPASS V16HQ, SKIN AIR OUTLET V 22HQ. R & R 16HQ AVIONICS VENTILATION SKIN EXCHANGE INLET BYPASS VLV IAW AMM 212655-000-001-B. OPERATIONS CHECKED NORMAL IAW 21-26-55-710-001-A.