Rear Wall

I have a 2011 Heartland Greystone 33qs. It appears there was a little water leak around the back window on the ladder side. The interior panel is a little soft. The outside floor etc are fine. Does anyone have a diagram of the rear wall construction and componants? It appears to have bat or Fiberglas insulation, at least behind the tail lights.

Would really like to know if the studs are aluminum or wood in the rear wall, I suspect wood

Any input or comments appreciated

Thank You very much.