As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW RETURNED TO GATE AFTER CABIN PRESSURE 2 FAULT. CENTRALIZED FAULT DISPLAY SYSTEM REPORTED OUTFLOW VALVE MOTOR 2 FAULT. REPLACED VALVE AND CABIN PRESSURE CONTROLLER NR 2 AS PRECAUTION. NO FURTHER FAULTS REPORTED. (NOTE: THIS INCIDENT OCCURRED ON THE GROUND SHORTLY AFTER ENGINE START).