Roof repairs

After you raise the roof membrane, there would be some type of plywood underlayment stapled or nailed to the roof trusses. That underlayment wood need to be removed as well to access the roof trusses. You would have to remove the entire roof to do this correctly. Not an easy job by any means, and would not be recommended by anyone not experienced in doing so. Once you remove the roof membrane, you will not be able to reuse it. Adhesive would need to be reapplied to underlayment then a new membrane. All roof openings will also need to be resealed along with the rain strips running along the sides.

I would pursue having the manufacture address since this issued occurred originally under warranty previously. If they will not help, IMO, trade it in for a new one and do not point the issue out to the dealer.