Sorry for the delay in posts, been really busy with real work. Now that I've given all the background, here this winter's project.
I discovered some wet spots in one of the stringers when installing a new fuel filter. I had done some quick "tap" tests of the transom and stringers when I bought the boat, and they seemed fine. The bulkhead at the back of the fuel tank was evidently soft, but I was OK with replacing that eventually. I suspected that the transom had been replaced at some point because the homemade setback had a non-BIA bolt pattern. No way it would have left Wellcraft drilled like that. Anyway, I obviously missed some spots on the stringers. Wet stringers are not exactly uncommon on a nearly 30 year old boat.
Here's a pic of the transom and rear floor. I'm taking the pic through a large hatch that the ski locker drops into (keep in mind these boats were more intended as stern drives so there's a lot of room back here in the O/B version).
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I unbolting the old static setback (well sealed), and poked around all the mounting holes - wood was dry. To confirm, I cut several "plugs" of glass out of the transom with a hole-saw to be able to probe around some more. You can see the ones I did around the inside of the mounting holes.
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The wood is bone dry. You can kind of see a dark layer in one of the holes - that's the reddish purple phenol-formaldehyde glue of marine plywood (I chistled some of the top veneers off to check it). At this point I was 95% sure somebody had replaced the transom.
Replacing the aft potions of the stringer would be easy due to the access, but under the cockpit is a different story. This boat has a full cockpit liner that's moulded as part of the deck (i.e. no plywood floor to lift up). Here's the big cockpit gas tank access hatch removed so I can poke around the forward sections of the stringers.
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I couldn't get to much of the stringers due to the height of the tank, bonding putty, and tonnes of foam.