How are GS Sun Voyager floors constructed?

[Old Fat Guy]

We have a 2006 Sun Voyager 8368 that has a soft spot in the bedroom floor. This was undoubtedly caused by a side window that was leaking (now repaired). I have researched as much as I can about repairing soft floors but have not found anything that actually describes the construction of the Gulfstream floor. Repair methods vary based on floor construction. Seems the two basic types of floor are the thin plywood sandwiched styrofoam panels laid on top of the membrane, or the thicker OSB wood sheets laid over the membrane. Can anybody tell me or, even better, provide pictures that show how Gulfstream constructed the floor in this vehicle? YouTube has a wealth of information on how to repair soft floors but I want an idea of what I'll be dealing with before I start to dismantle it so I can have the necessary materials on hand. Any help will be greatly appreciated.