As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW RETURNED TO FIELD DUE TO MANUAL PRESSURIZATION MODE INOP WITH THE AUTO MODE ALREADY ON MEL. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE MANUAL PRESSURIZATION CONTROLLER AND THE DIGITAL CONTROLLER TO CLEAR THE MEL WITH NO FURTHER DEFECTS NOTED.