I don't know if it is a common problem with your model of boat, but in general, if a catamaran
has its decks warping around the anchor locker
area, I would be looking at the main beam and supporting bulkheads VERY closely. If that is where your problem lies, then you will be very happy to get out of it for $10,000.
Other than that, I cannot think of why a deck
would be warping on a catamaran
in that area, although I suspect you may be using the term "warp" in a manner that is more alarming than it should be. Posting
pictures and/or a more detailed description would be very helpful.