What was found
LOSS OF CABIN PRESSURIZATION OCCURRED AT 29,000 FEET, CABIN ALTITUDE CLIMBED TO 11,000 FEET. INITIATED EMERGENCY DESCENT PROCEDURES AND PRESSURE WAS REGAINED AT 17,000 FEET. CONTINUED TO DESTINATION AND LANDED WITHOUT INCIDENT. OXYGEN MASKS DID NOT DEPLOY. FOUND RIGHT PACK FLEX DUCT FORWARD OF COLD AIR CHECK VALVE DISCONNECTED AND CLAMP MISSING. REPLACED CLAMP AND INSTALLED NEW FLEX DUCT. OPERATIONAL CHECK OK, AIRCRAFT RETURNED TO SERVICE.