What was found
GYM - DIVERSION - DURING CRUISE, EN ROUTE TO SJD FROM PHX, AIRCRAFT BEGAN TO DEPRESSURIZE AT FL330. CREW PERFORMED EMERGENCY DESCENT, PASSENGER O2 WAS DEPLOYED AND USED. AIRCRAFT DIVERTED INTO GYM WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND SEVERAL FEET OF AFT CARGO DOOR SEALING DISPLACED. RE-INSTALLED SEALING AS REQUIRED. PRESSURIZATION CHECKS WERE GOOD AND AIRCRAFT MAINTENANCE FERRIED BACK TO PHX FOR REPLACEMENT OF USED O2 GENERATORS.