We visited the Winnibago factory (for the second time) when we were looking for a new diesel class A back in 2008 - 2009. While I understand the market was rough during that time they just didn't give me the time of day and their front person could not even tell me what models were in current production. I also read considerable threads on this forum concerning poor factory service. We decided not to pursue them any further.
Tiffin never questioned any issue after purchase but rather just took care of things. They also took care of some issues after the warrantee time had ended. That is why I send anyone who asks my opinion to Tiffin.
It seems to me Winnebago would be more customer friendly considering it was a new purchase and the repair is a nickle & dime issue to the factory.