As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UNABLE TO CONTROL PRESSURIZATION OR TEMPERATURE, RETURNED TO DEPARTURE BASE. MAINTENANCE FOUND BOTH AUTO TEMPERATURE CONTROLLER INOPERATIVE. ALSO PNEUMATIC DUCT OFF RIGHT AIR CYCLING MACHINE ON TURBINE SIDE. LEFT AND RIGHT TEMPERATURE CONTROLLER REPLACED AND DUCT REINSTALLED. SYSTEM GROUND RUN AND CHECKED SERVICEABLE.