As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH AUTO CONTROLLER NR 1 INOPERATIVE ON MEL, NR 2 CONTROLLER FAILED AFTER TAKEOFF. THE CREW DECLARED AN EMER & RETURNED WITHOUT FURTHER INCIDENT. THE ACFT WAS GNDED. R & R OUTFLOW VLV ACTUATOR IAW MM 21-32-05. PRESSURIZATION FUNCTIONS NORMAL IAW 21-32-00.