What was found
FLIGHT 5109 - AFTER TAKEOFF FROM CLE AIRCRAFT WOULD NOT PRESSURIZE, FLIGHT RETURNED TO CLE. REPLACED THE CABIN DOOR VENT VALVE CONTROL ROD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FLIGHT 5109 - AFTER TAKEOFF FROM CLE AIRCRAFT WOULD NOT PRESSURIZE, FLIGHT RETURNED TO CLE. REPLACED THE CABIN DOOR VENT VALVE CONTROL ROD.