I don't think Schwintek slide mechanisms showed up on Winnebago until 2012 - those seem to be the problem ones.
Check the roof seals on the edges when you get it, and maintain them. the seal is critical to holding the edges down on the one piece fiberglass.

Winnebago has a great online parts system and all parts are numbered. I was able to get a full bill of materials for my specific serial number in the online reference center. From that I'm able to find parts pretty easy, alot of them through Winnebago Outdoor that sells on Amazon. I just ordered a gas strut for a door I broke at a campsite.