pepsigns -> is this under the wardrobe, where you can lift the floor to see what is underneath? The area I'm thinking about is where the fresh water pump is, and there are a number of plumbing connections, some of them use hose clamps. This area is also where the wheel well is, and if there is a crack in the lining, water can get sprayed into it. If possible, can you photograph this and post it. It should be very similar to my 1987 32' Excella.
1987 Excella 32-foot
1999 Dodge Ram 2500HD Diesel