Loud fan after dropping the MBP on tiles

I had only had my Retina MBP for a week when disaster struck! I was carrying it under my arm to another room when it slipped from my grasp & fell on the tiles of my lounge room floor, landing on the corner. There is a small dent, which I am not too concerned about, but I am concerned about the right fan. It is rather loud – noticeable at all times. I know that Apple doesn't cover accidental damage under warranty, so I was thinking of prying off the bottom cover and having a poke around. Is this something I may be able to fix without voiding warranty by removing stickers etc?