As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB CREW REPORTED, RECEIVED A CABIN ALTITUDE HIGH MESSAGE. CREW FOLLOWED QRH PROCEDURES, DEPLOYED OXYGEN MASKS AND RETURNED TO FIELD. MAINTENANCE WAS DISPATCHED TO AIRCRAFT FOUND PRESSURIZATION CONTROLLER IN MANUAL MODE COMPLETED AN OPERATIONAL CHECK OF SYSTEM. ALL CHECKS WERE GOOD RESTOWED MASKS AND RETURNED AIRCRAFT TO SERVICE.