What was found
LOSS OF CABIN PRESSURIZATION OCCURRED DURING INITIAL DESCENT AT 31,000 FEET. EMERGENCY DESCENT WAS MADE TO 10,000 FEET AND CABIN PRESSURE WAS REGAINED. FLIGHT CONTINUED TO DESTINATION WITHOUT FURTHER INCIDENT. AN UNEVENTFUL LANDING WAS ACCOMPLISHED. REPLACED CABIN PRESSURE CONTROLLER AND RESECURED LOOSE DUCT AT RIGHT ACM. OPERATIONAL CHECK NORMAL ON CABIN PRESSURE CHECK. AIRCRAFT RETURNED TO SERVICE.