As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT RETURNED FROM FLIGHT DUE TO BOTH PRESSURE CONTROLLER SYSTEM INOPERATIVE. FAILURE WAS CAUSED BY WIRE #7922TK24R SHORTED TO SHIELD 50 CENTIMETERS FROM OUT FLOW VALVE. REPAIR CARRIED OUT AND #2 PRESSURE CONTROLLER REPLACED. SYSTEM CHECKED SERVICEABLE.