You might TELL the asshat Dealer that if your VIN falls in the window, it's supposed to be replaced, period. No "bring it in so we can listen, we'll look at it if it fails, no I'm too lazy to spend 2 minutes on my computer to log-in to Yamaha's Dealer Website......" And Dealers wonder why no one likes or trusts them. Contact Yamaha N. America, turn your Dealer in.
Bruceintucson is right duhs10, they have to replace it regardless of whether it's failing or not. That dude is playing you for a fool just like many dealers have been doing to other fj owners. I have to wonder how much of peoples time these dipshits have wasted with this bring it in and will listen to it crap. I think you need to call this guy back and have another talk with him, and don't be so polite this time.