As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED AT 36000 FT ERRATIC CABIN ALTITUDE OF 8100 FT AND CLIMBING. WENT AMBER AND WENT UP TO 8800FT. WENT TO MANUAL MODE AND WASN'T ABLE TO CONTROL IT BACK TO WITHIN TOLLERANCES. EMERGENCY DESCENT TO 10000 FT THE CREW ALSO REPORTED SECTION OF MAIN CABIN DOOR SEAL WAS MISSING. MAINTENANCE REPLACED THE AUTO PRESSURIZATION CONTROLLER AND REPAIRED MAIN CABIN DOOR SEAL. OPS CHECKED GOOD.