As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE, RIGHT PACK SEIZED CAUSING LOSS OF PRESSURIZATION DUE TO LEFT PACK BEING DEFERRED. OXYGEN MASKS DEPLOYED, EMERGENCY DECLARED AND FLIGHT LANDED WITH OUT ISSUE. AFTER MAINTENANCE INSPECTION, FOUND THE OXYGEN GENERATORS HAD BEEN USED. MX REPLACED ALL OXYGEN GENERATORS THAT WERE USED. OPS CHECKED RT PACK GOOD.