While on the road this weekend, I looked down and saw that the large chainring was warped. I have a Cannondale with a TruVatiV Elita SL Double, 39/53. This is the crank that came with the bike. Bike is about 1.2 years old, and only 300 miles. I doubt the crank in under warranty, but I will check. Should I replace the entire crank? If so, any recommendations? Also, what would cause the chainring to warp??