My most recent rmbp developed stuck pixel clusters after 2 months and took it in and got a replacement. You paid premium for your laptop, you deserve premium product. Take it in. They shouldn't give you trouble in replacing the display once you can show them the dead pixel.
I have the same issue. I took mine in today, and the Genius wouldn't help me, I guess there is a minimum amount of pixels gone bad before it can be replaced. He did suggest to call apple care and see if they'd help out.