As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FROM ORD TO GSP, THE AIRCRAFT EXPERIENCED LOSS OF CABIN PRESSURE AT 33,000 FT. CREW DECLARED AN EMERGENCY WITH ATC AND PERFORMED AN EMERGENCY DESCEND. AIRCRAFT LANDED IN GSP WITHOUT ANY FURTHER INCIDENT. MAINTENANCE PERSONNEL INSPECTED AND FOUND FOREIGN OBJECT IN THE LT OUTFLOW VALVE, ITEM WAS REMOVED AND AN OPERATIONAL CHECK OF SYSTEM WAS SATISFACTORY. AIRCRAFT WAS RELEASED FOR RETURN TO SERVICE