Go to
http://www.keystone-montana.com . Near the top click on "Dealer Locator".
Since you're out of warranty I don't know if Keystone will cover that or not. You might call them direct and ask. I would call, not email. On their contact page there should be an 800 number you can call.
Sorry I'm not much help but Keystone has to answer your question. Good luck. Let us know what you find out.