A friend of mine has a ~2004 356. When they surveyed and since then when using a moisture meter near the anchor winch they got indications of "moisture" in the area around the winch. They took off the winch in the off season to check for leaks and moisture and found none. Let it dry out for months and then reinstalled the winch. They still get the indications from the meter. I don't know what brand or model meter they are using.

I'm thinking that there might be a different density of core used around the winch vs the regular balsa coring found everywhere else. Is this possible that there is maybe some high density plywood there vs the balsa for strength to mount the winch? Has anyone been inside that area of the decking to know?