I just got off of the phone with the tech at Gates and he suggested that I replace the belt and keep the old one for a spare. Since the belt was stretched by partially coming off of the sprocket, it may have broken a carbon strand. There is no way to monitor the stretching as the method of failure is catastrophic!

I will replace the belt! As he said if it does fail and the captain is standing it can be very uncomfortable! Stoker would not be happy pedaling home while I got a free ride.