Fixing a Jabsco Water Pump

Our Jabsco PAR-MAX water pump started going off intermittently for about a second, every hour or so. We looked high and low for a slow leak in the water system, but we didn't find any leaks. I wrote Jabsco with the symptoms, and they wrote right back telling me the cause. Apparently the check valves inside the pump failed. They sell a kit to fix it (18911-7030 ) for $25.00. I bought the kit and fixed the pump. A new pump would have been $150.00.