Sorry to hear about your floor. I had a simular problem a few years ago, with a Bantam B17 (floor was luan and styrofoam). The source of the leak was at the front base of the trailer, water ran down the front and into the subfloor at the bottom molding.
Here are photos of my repair: https://www.flickr.com/photos/cdrdwd...57627084950665
Click on the photos to larger photos and notes.
The repair worked well, but was a lot of work (but much cheaper than the $3000 that General RV wanted to repair it (same as the value of the unit at the time - if the floor was good).