Here is a contact at the factory. I would try here first. I would ask the factory to reffer you dealer and prearrainge with them to get the work done. I am not aware of any problems as you describe with the Land Yacht motorhomes, but you should have some recourse regarding Warranty.
(877) 596-6505 it rings as the airstream tech support line.
Good Luck, let us know how it turns out.
WBCCI #5501 AIR # 49
1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato