Les,
Here is an option to consider. Check out this web site
http://www.rvleaks.com/index.htm
There are several dealers in your area that use this technology to find water leaks in rvs. I have never used it, but have spoken to people who have said it is well worth the price. Those pesky water leaks can be hard to find and this company's process identifies exactly what's leaking--no guessing.
Hope this helps......................