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I just bought a 1980 13 sport with a corroded drain tube - the outside 3in was gone. The foam at that point is damp- not soaked. I'm thinking of removing the entire tube and rigging up a pressure blower and blowing hot air through the hole. The air will dehumidify the foam. Not to get technical but once the edges of the tube hole dry out, the moisture further in the foam will diffuse towards the dry areas and be removed in the air stream. Even though the foam is closed cell, diffusion will move the moisture towards the drier parts. Worth a shot- the blower can run for weeks if needed