As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE CONDITIONING VALVE(23D) FAILED TO OPEN AFTER TAKEOFF. THE CABIN FAILED TO PRESSURIZE AS A RESULT. MAINTENANCE FOUND THE CONDITIONING VALVE ACTUATOR MOTOR JAMMED DUE TO A FAILURE OF ONE OF THE LIMIT SWITCHES. THE MOTOR HAD BEEN REPLACED 3 DAYS PREVIOUSLY.