The more i look at my stringers, the more i think they DO NOT need to be replaced. My stringers seem damp, but when poked with a screwdriver, they seem solid. They are dark in color but dont seem soft. When i removed the floor, there was ice crystals between the foam and deck, but now that the deck has been removed the foam seems fine. Should i continue on my path of replacing the stringers, or can i just leave them and the foam in and put a new deck on?