As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DIVERTED ENROUTE BECAUSE THE CABIN PRESSURE BECAME UNCONTROLLABLE. CABIN PRESSURE CONTROLER (CPC) FAILED DUE TO INTERNAL FAULT. REPLACED THE CABIN PRESSURE CONTROLER, THAN PRESSURIZED AIRCRAFT USING APU IN AUTO, STANDBY AND MANUAL TO ENSURE CORRECT OPERATION. NO DEFECT NOTED.