As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 13 FT THE AUTO FAIL LIGHT CAME ON, WENT MANUAL BACK TO AUTO FAIL LIGHT OFF AND BACK ON. CABIN WENT TO 8.6 FEET DIFFERENTIAL PRESSURE 9.4 BOTH OUT FLOW VALVES CLOSED, CABIN STILL CLIMBING AT FL 20.0. REPLACED AUTO PRESSURE CONTROLLER, OPERATIONAL CHECK OF PER BOEING MAINTENANCE MANUAL 21-31-02.