From the neighbor I met last night at our block party. Seems the flapper in his check valve broke loose, lodged and the pressure blew the valve apart and flooded his crawl with sewerage. He cleaned the area up for me, and I replaced with a new "Silencer" 2 inch valve. I charged him, well under a bill. He was very happy as I was. I was dreading a ejector pump changeout on such a nice day. I was very greatful for his business, and I met a new neighbor and hopefully have a new friend.