For the record, I cruised my Mercruiser service bulletin index and saw nothing about it, either. This was on my microfiche, so maybe it came out after my last updated card.
I seem to remember that with Wellcrafts, it was easier in the long run, to take most of the plywood-and-carpet parts out with a screw gun, first. I own a Wellcraft 18.5 now, myself, which isn’t too bad. But I know the ones you’re talking about! Engine? There’s an ENGINE back there, under all the carpet and cushions????
Long live American manufacturing!