As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, RECEIVED VENT SKIN VALVE FAULT. EXTRACT VALVE INDICATED OPEN AND THE AIRCRAFT WOULD NOT PRESSURIZE. AIRCRAFT RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE SKIN AIR EXTRACT VALVE, OPERATIONAL CHECK OK.