urgent reply please: floor problem

[rebel beck]

Okay folks we have just torn out the first 3 feet of flooring under our front window (after my husband fell through the floor where the gaucho goes) leak was worse than we thought. We found one problem, some drain hose on the left side if you are standing in front of the gaucho does anyone know what this is to? It is clear plastic. Also the frame looks great except where water has come in, in a few areas. This drain hose had worked back into the trailor at some time and had caused some damage. The belly pan looks good except for a few small pin size holes what do we need to fill these in with.
I've got my husband in the mood to work and need quick response.

Thanks,
Becky