As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURIZATION CABIN WOULD NOT PRESSURIZE IN AUTO. REFERRED TO QRH AND WENT TO MANUAL CONTROL. IN MANUAL CONTROL RATE SEEMED VERY SLOW, IT TOOK AROUND 2 MINUTES FOR THE CABIN TO START DOWN FROM 5000 FT TO 200 FT. RETURNED TO PSP. REMOVED AND REPLACED CABIN PRESSURE CONTROLLER WITH A SERVICEABLE UNIT. OPS CHECK GOOD.