On an unrelated note, the service here kinda bites; There are so many people at the local service center that I have to spend a couple of hours (literally) lounging around, waiting for my turn to come up.
Be thankful that your service center has excellent service.
... Incidentally, I once dropped my phone flat on the screen a few weeks after buying it. There was nary a scratch nor a chip on the Gorilla Glass facade. However, the AMOLED layer underneath was completely shorted out; Half the screen was fine, the rest was a mess of RGB splotches.
I had it taken to that local Samsung Service Center I'd just mentioned. By then, the display refused to turn on at all. By the next day, they put it down to faulty manufacturing, and I got the display replaced for free
Lucky, or just dumb?