What was found
WHILE IN CRUISE AT FL350 THE CABIN PRESSURE STARTED TO CLIMB. CREW DESCENDED TO FL330 IN AN ATTEMPT AT CABIN PRESSURE CONTROL WHICH DID MAINTAIN SETTING UNTIL TOP OF DESCENT. AT THAT POINT, WITH ANT-ICE ON DUE TO WEATHER AND WITH THROTTLES RETARDED FOR DESCENT, THE CREW LOST CONTROL OF CABIN PRESSURIZATION AND THE OXYGEN MASKS DEPLOYED. CREW DECLARED AN EMERGENCY AND PERFORMED A RAPID DESCENT TO 10,000 FEET. FLIGHT LANDED AT OPF WITHOUT FURTHER INCIDENT. NO CORRECTIVE MAINTENANCE ACTION WAS PERFORMED AS AIRFRAME WAS BEING DELIVERED TO OPF FOR DECOMMISSIONING. (S)