As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST AUTO PRESSURIZATION AT FL330 WITH NO CONTROL OF OUTFLOW VALVE. EMERGENCY DECLARED. DESCENDED TO 17K, REGAINED CONTROL OF CABIN ALTITUDE WITH MANUAL CONTROL. NO MASKS DEPLOYED. BOTH CONTROLLERS FAULT OUTFLOW VALVE MOTOR. REPLACED OUTFLOW VALVE ACTUATOR ASSY AND NR 2 AUTO PRESSURE CONTROLLER. NO FAULTS.