If it was powered off and not plugged in and it was becoming hot to the touch, I would call customer service since it's still under warranty. A replacement would most likely be a refurbished unit, nothing wrong with that though. It would still have the remainder of your warranty left on it (or 90 days, whichever is longer).
I'm not sure if anyone in one of the stores would be able to help you but it's worth a shot if you're close to one.
*I said nothing wrong with a refurb because I received one when my N1E developed the dreaded cracked bezel. The refurb worked great, I still have it.
This sounds dangerous to me. I'd be afraid of actual fire. I'd shut it off and return it ASAP.