[1KillerSS]

Unfortunately I don't think finding another dealer will matter either, once GM says hey your not covered, I think you'll have to deal with the GM's regional manager for all the dealerships in the surrounding states. To get them to change their mind. I had a friend that had a similar experience to yours. Not with a 5th gen 1LE but he was at the dealership looking for some warranty work. The dealership contacted GM to make sure they would get paid and GM said no. He ended up getting it taken care of, but it nearly took an act of congress. He had to deal with GM direct and worked his way up the chain of command to do it. That was over 15 years ago so I have no idea what you would need to do today. Good luck man.