As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST PRESSURIZATION IN AUTO MODE INFLIGHT, CREW REPORTED THAT THEY LOST PSI RAPIDLY AT 40K FT, CRUISE WITH DELTA P AT 9.1. CABIN ALTITUDE INCREASED TO 10 FT WITH CABIN RATE MAXED OUT. EMER PSI ACTIVATED AND CREW COULD NOT RESET. PRESSURIZATION FAULT LIGHT ILLUMINATED. CO-PILOT WAS ABLE TO GAIN CONTROL OF CABIN IN MANUAL MODE. MX REPLACED THE CABIN PRESSURE CONTROLLER AND PERFORMED SATISFACTORY OPS CHECKS.