Wouldn't that be a warranty thing, or do you just want to fix it yourself?
My guess is that you cannot just attach your new cable to the end of the old one and pull.
I looked quite a bit at the wiring diagrams for the 40AD and also under the slide to see how Winney did the wiring to the roof because I am interested in getting a Datastorm installed after we order/get our 40AD. Short answer - I don't have a clue how they routed the roof wiring.
As an aside - any time you do any cabling where it matters, always buy quality. Quality is Belden cable and for the connectors always buy Amphenol products.