What was found
LOSS OF CABIN PRESSURE OCCURRED AT 33,000 FEET EN ROUTE MSP-HOU. OXYGEN MASKS WERE DEPLOYED THROUGH CABIN. EMERGENCY DESCENT WAS ACCOMPLISHED AND CABIN PRESSURE WAS REGAINED. FLIGHT CONTINUED TO DESTINATION WITHOUT FURTHER INCIDENT. FOUND CLAMP ON AFT SIDE OF WATER SEPARATOR LOOSE AND NOT POSITIONED PROPERLY. REPLACED CLAMP. ALSO, REPLACED CABIN PRESSURE CONTROLLER AND AMPLIFIER. AIRCRAFT RETURNED TO SERVICE.