As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DESCENT PERFORMED BECAUSE AUTO PRESSURIZATION CONTROL INOP, MANUAL WAS OK. PASSENGER OXYGEN MASKS DEPLOYED. REPLACED OUTFLOW ACTUATOR AND RIGGED SUGAR SCOOP AS PRECAUTIONARY MEASURE AND REPLACED PRESSURE AMPLIFIER. PERFORMED TEST FLIGHT AND AUTO PRESSIZATION SYSTEM CHECKED NORMAL.