Sorry, I'm having a hard time remembering (June). I went through that too-needed a new heating sensor and I had to pry the whole plaque off and send it, as they sent a whole new box, minus the door, racks, wood tube, etc. Of course they tried a new temp control first (not the problem) so I DID have to look up the warranty number, could have sworn that was where it was.
I will look when I get off work, unless Ron or someone can answer you first.