I have to agree with Kyle. I doubt there is anything anyone could post in a Facebook reply that would allow you to easily fix that. You'll most likely need to request a replacement. :-\
Do you have a screen protector on it? That could be happening if the screen protector isn't on right and it's reflecting the light to show those lines. Just a thought.
I would call Nintendo. It looks like a defect. Since someone already commented the number to Nintendo Customer Service, I'm going to shut off commenting. (^^)