As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURIZATION CONTROLLER WOULD NOT MAINTAIN CABIN ALTITUDE. CONSTANT CLIMB OF 1500 FT/MIN SETTING OFF CABIN ALT WARNING HORN AT 10000 AND CLIMBING TO 14000 WHILE LEVEL AT FL 250. PERFORMED DECAY CHECK OF ACFT IN REF TO JRH AND DECAY PASSED, SO AS A PRECAUTION REMOVED AND REPLACED CABIN PRESSURE CONTROLLER IN REF TO AMM 21-31-010-4, OPS CHECKED GOOD. ACFT OK FOR SERVICE.