Hey sagging,
This is apparently common with Beneteaus.
I have a 88, 285, and I have to re do the inside.
I have looked into this, and a number of folks with the same problem have taken out the old, and used the pieces as tmplates for carpet replacement. Surface prep is very important before you glue up the new. I tried to re attach the vinyl in the head. I had to remove all the foam from the vinyl, annd the cabin, and I used outdoor carpet cement, (non solvent), and it stuck well, but not too good looking.
I m going the carpet route as soon as I hav a chance.
Good luck
BindCat