It is amazing how much water can accumulate through condensation, especially over a long period of time. Still, there has to be a way for it to get in.

To check for leaks: swab all deck joints and attachment points with a soap solution. Then, reverse the hose on a vacuum cleaner to blow into the drain holes. If you get bubbles, you have leaks.

Be very careful not to blow the boat up! <img src="http://www.catsailor.com/forums/images/graemlins/shocked.gif" alt="" /> Seriously! <img src="http://www.catsailor.com/forums/images/graemlins/laugh.gif" alt="" /> Don't attach the vacuum hose. Just hold it an inch or two from the drain hole. It takes minimal pressure to form bubbles!