What did the Winnebago rep say when you called them? I ran into the same issue several years ago at a local Winne dealer. I called the toll free customer service # the Winne rep said he was going to contact the dealer, he told me to give him 15 minutes and I should call the dealer back and make the service apt .When I called back there was no problem getting the warranty service. Needless to say after a few years the place changed ownership. That's why some dealers do a good business and others go out of business.
07 Itasca Ellipse 40fd, 2014 Honda CRV, greyhound lab mix, pit pointer mix(RIP bessie) , shar pei mix, stupid cat, wife