As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE TO ATL - DURING FLIGHT, THE AIRCRAFT CABIN WOULD NOT PRESSURIZE FULLY. THE CREW DROPPED BELOW 10,000 FT AND USED THE PRESSURE DUMP TO RELEASE REMAINING PRESSURE AND RETURNED TO CLE. MAINTENANCE TROUBLESHOT THE PRESSURIZATION SYSTEM AND FOUND THE DIGITAL PRESSURE CONTROLLER MALFUNCTIONING AND REPLACED IT. AFTER REPLACING THE DIGITAL PRESSURE CONTROLLER, THE PRESSURIZATION SYSTEM OPERATED NORMALLY