As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE CLIMBING BOTH PX REGULATORS FAILED. AIRCRAFT LANDED WITHOUT INCIDENT. AIRCRAFT SYSTEM TROUBLE SHOOTING FOUND THAT SYSTEM NR 1 CABIN PRESSURE CONTROLLER WAS U/S. NR 1 CABIN PRESSURE CONTROLLER REPLACED. SYSTEM CHECKED SERVICEABLE I.A.W. 21-29-0. NO FURTHER PROBLEMS ON SUBSEQUENT FLIGHTS.