MacBook Pro Hinge Noise/Problem

Hey guys! My MacBook Pro's Hinge makes the little pop sound as I go to close the screen, and also, where the sound comes from, I put my finger there (Right Side of open MacBook Pro Where Hinge Connects to Unibody), and have noticed when the sound happens, I feel a little vibrations/pop under the aluminum casing. I'm terrified of this problem mainly because I spent $1,800 on this laptop, and have heard of other people's hinge cracking and all. Can you guys tell me how I should go about this, and what Apple has done to yours if it has happened (Replace/Repair, etc.). Also, mine is under warranty. Thanks!