Make a genius bar appointment and exchange it--in my experience, as long as you can demonstrate the "problem", it's highly likely they'll swap you out no questions asked.
My screen is perfect--I checked various colors using the free MyLite app, first thing out of the box, as I had heard about the yellow spot issue. If I had a dead pixel, I would not live with it. This is not like a widescreen TV that you're viewing from 8-10 feet away. I would think a dead or stuck pixel would draw your eye to it, now that you see it.