If you have any dead pixels, or any other hardware issues send it in for that and likely Samsung will remove the bug. I've used this app to check for dead pixels on my screen and have found a couple. Wasn't worth sending it in for a repair but if I had a bug in my screen I would. Good luck.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?