What was found
LOSS OF CABIN PRESSURE OCCURRED DURING CRUISE FLIGHT AT 31,000 FEET. CABIN PRESSURE WARNING LIGHT ILLUMINATED WITH DROP IN DIFFERENTIAL PRESSURE. CREW INITIATED RAPID DESCENT TO 15,000 FEET AND FLIGHT WAS CONTINUED TO DESTINATION. CABIN RPESSURE STABILIZED AND AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED DAMAGED AIR/GROUND CHECK VALVE CONNECTOR, OPERATIONAL CHECK NORMAL.