I took mine into the Microsoft Store where I bought it two years ago. The tech looked at it, said, "You've got burn-in, huh?" and immediately went in back for a replacement. When she detached the screen from the keyboard and put it down, I noticed it didn't lie flat, and the screen was bulging. She said the battery was expanding, and it was imperative to replace it - it could be dangerous. She transferred everything she could to the new computer, took the old one and didn't charge me anything. (I still have to deal with reinstalling all my programs, but at least the machine isn't about to explode!)
I bought my computer from a military base but I plan on taking it to the Microsoft Store to see if they can help me. I went to the Microsoft Store twice before when I had a problem with power supply kept going out and they were very helpful. I'll post an update after I go to the store. Thanks