Yes, I’ve also had some leaks around the fittings in the cockpit sole. The water ingress was slow so didn’t get fixed for some years and probably contributed to the subsequent corrosion around the skin fittings in the engine room. I’ll PM you with the photos of the fittings on Playtime so you can see what the damage has been.
I had to remove the calorifier to get the port side skin fitting out. I can just imagine the problems if you also have a genset in that area!
You can initially check the skin fittings on the outside, though, next time the boat is out of the water. This will give you the first indication if you have a problem.