As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3164 - DIV - DUE TO VENT SKIN VALVE FAULT AND UNABLE TO DETERMINE VALVE POSITION, FLIGHT CREW UNABLE TO PRESSURIZ AIRCRAFT. CORRECTIVE ACTION. SKIN AIR OUTLET VALVE PLACED ON MEL DEFERRAL. R/R SKIN AIR VALVE. A/C OK FOR SERVICE.(8342866)