As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5809 - PRES - EMERGENCY DESCENT DUE TO LOSS OF PRESSURIZATION. FLIGHT CONTINUED TO DESTINATION. CORRECTIVE ACTION: REPLACED RELAYS K21 AND K10646. MTC FOUND LT HIGH STAGE VALVE STICKING. REPLACED HIGH STAGE VALVE, FAN AIR TEMP SENSOR, AND REVERSE CONTROLLER. C/W NO-GO PROCEDURES.