Livewell question (1999 R81 Sport)

My livewell continues to drain as I am on plane when I have it set at recirc or auto. Am I looking at an expensive fix, or is there something I can do myself. Any help or advice is greatly appreciated. I just noticed this Sunday.

sounds to me like the valve is sticking open. first thing I would do is open the valve and use a garden hose and push water back up into the livewell through the outside drain could just have something caught in there. if that doesnt work get a new valve easy install.