As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 AUTO PRESSURIZATION SYSTEM FWD AND AFT VALVES WOULD NOT CLOSE. NR 1 SYSTEM COULD NOT CONTROL AIRCRAFT PRESSURE. ATTEMPTED TO CONTROL PRESSURIZATION MANUALLY. STILL COULD NOT CONTROL PRESSURIZATION WITH THE NR 2 FWD AND AFT VALVES IN THE OPEN POSITION ITEM CLOSED WITH OPS CK OK. REMOVED AND REPLACED FWD AND AFT OUTFLOW VALVES AND SYS 2 CONTROLLER, PRESSURIZED A/C AND CHECKED OPERATION.