Same thing on my '05 393. Frankly I wasn't surprised; the first time I cut a hole in something to add some new gadget, I put some painters tape over the panel to protect it and when I pulled the tape off, the varnish came with it. Later it started doing it on its own in little bits here and there, and then over the winter it started coming off in sheets. Moisture gets under it and seperates the varnish from the wood.
Have you seen the Beneteau factory video? I don't know where I saw it but it shows a bit of the joiner shop and you can see these panels of that famous South American Mystery Wood going about 100 mph through a machine that sprays that Mystery Varnish on them. Honestly I don't know how anyone would expect that stuff to stick.
Anyways, like everyone else with this problem it's very disappointing to me, but on the other hand it's really not difficult or expensive (in materials) to revarnish whatever panels or doors have peeled off.
The peeling varnish will actually come off very easily and leave a nearly flawless bare wood finish behind. Remember the painter's tape? I laid out a grid of tape over the aft galley bulkhead and started pulling. I made a game of seeing how large a piece I could get in one pull without tearing it off.
That was last year. I left it bare and started stripping the other larger panels a few weeks ago. Taping and pulling is kind of tedious on a large panel like the forward main bulkhead. Instead I got a razor blader scraper tool (the kind that is basically a handle for a standard straight razor blade) and used it to start the edge of a peel. Then grabbed the edge with my fingers and teased it along with the scraper, not actually scraping on the wood but using the blade to help lift the peel as I pulled it up.
I did make a few nicks as I refined the technique but a dab of stain (Zar 120 natural teak, I think, is a good match for mine) will cover those.
I just took the two cabin doors home and stripped one of them with the razor technique in about 20 minutes. The largest single peel I got was probably over 18". I'm wading through piles of stripped off varnish in the basement!
Since the doors were off and home I removed the hardware and stripped them bare with a power sander and some 220 grit paper. This got them fairly slick and I probably could have stained them then but I ran over them again with 400 grit to smooth them out some more. I'm not sure whether this will have been a good idea or not. I have no idea what kind of wood that stuff is and the super fine finish may have closed up the grain too much.
Well in any case I just put the first coat of teak natural stain on one of them. The Zar stuff is kind of thick, which really helps with the drips, but you have to work fast. After wiping it down to even everything out, it looks great. I'm not sure I can tell that I just refinished the thing.
The bottom line folks is that it's probably within the means and skill of most of you to deal with this yourself and have a much higher quality result in the end plus the satisfaction of doing it. What's Bene gonna do? spray more of that mystery crap all over everything? Yeah, that'll really help.
So after two coats of stain I'll varnish the doors and see how they look. I revarnished the little cabinet door under the galley sink last year after peeling the varnish but without restaining it. It turned out great. It's lighter in color now because that stuff Bene uses has a tint in it. Personally I think the wood (or whatever it is) is a lot prettier with a true clear varnish on it.