As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER BEGINNING OUR DESCENT FROM 45,000 FT. I LOOKED DOWN AT THE PRESSURE CONTROLLER AND CABIN ALTITUDE GAUGE AND NOTICED A CABIN CLIMB OF GREATER THAN 1,000 FPM AND INCREASING WHILE THE CABIN ALTITUDE GAUGE WAS COINCIDING WITH DECREASING PRESSURIZATION. MADE A COMMENT THAT WE WERE LOSING PRESSURIZATION AND THAT WE NEEDED TO LET ATC KNOW. AT THAT TIME WE GOT A CABIN ALT LIGHT. THE CABIN ALTITUDE REACHED APPROXIMATELY 14,000 FT BEFORE THE CABIN STARTED DESCENDING AGAIN.