What was found
PASSING FL280 IN CLIMB, THE CABIN ALTITUDE ALERT ACTIVATED, CLIMBING THROUGH 9000 FT, STARTED DESCENT AS CABIN REACHED 10,000 FT. DECLARED EMERGENCY FOR DESCENT. CREW VERBALLY REPORTED THAT THEIR CABIN PRESSURE PAGE SHOWED SKIN AIR VALVE, EXTRACT AND SAFETY VALVE ALL INDICATED CLOSED. FOUND THE RT PACK OUTLET BELLOWS CLAMP BROKEN AND BELLOWS SEPARATED. REPLACED THE CLAMP. OPS AND LEAK CHECKED OK.