I'd take it in if I had the time to be laptop-less for a while.
IF something happens to your LCD, there's small chance that they just might tackle you with that, and say something like "There's a dust underneath the Apple Logo, user's fault, and it caused blah blah to blah blah so you're not covered by the warranty"
When I got my laptop repaired, and it came back with a small scratch on the battery cover, I took it back to get it replaced. They were nice enough to just ship another battery cover to my home address (after getting it in to their repair shop).
So now I have two covers, I still use the scratched one since I really don't care but I know I have a spare one if something happens to it 🙂