Second Opinion?
I read a local article on mosture detection, and there were examples of wildly erroneous readings. I wish I could recall the publication, but in any event, it has made me very wary of the accuracy of the diagnostic. I have never heard of a boat of that vintage with that kind of issue. Most were mid 1970's to mid 1980's. I would not spend a dime on any remedial process until and unless it was verified a second time by someone who is arms-length away from a repairing source, and certainly not without a core sample checked by a lab. What caused you to get one in the first place? Rick D.