What are the decks on a mainship 34 made of?
Some are balsa core, some plywood, some foam, depends on the year and the area.
The flybridges are balsa core, foredeck balsa or plywood, cockpit and side decks balsa or plywood.
Even if they are wet they are easy to fix if you can do it yourself. If you are paying someone, then it will be pricey.
Let a surveyor tell you if the cores are wet, then price it and act accordingly.