I started to notice a burning smell when the heat was on, took it to the dealer, and of course they said nothing was wrong. I was going to take it back, then I decided to Google 2008 MHX smell, and of course there were many hits, and one person mentioned having the dealer check the TPU gasket.
Call the dealer, they checked it out, and sure enough, leakey TPU gasget!!!!
NO more smell