This also happened to a guy that I know. Derailler either failed or shifted into the spokes. I'm not really sure what happened exactly, but his derailler tore away and gashed his right seatstay. Huge crack in his carbon frame. Basically unsafe and unridable. Trek did not accept liability. He phoned them and eventually got to someone who said that it was most likely a mechanic error and the derailler limit screws were not set properly, thus causing the derailler to shift out of its intended range and into the spokes. He then went to the bike shop and they refused to accept responsibility even though the frame was new. Not sure if the guy ever got the frame warrantied or not. Sorry that happened to you. It sucks especially considering that nobody wants to accept responsibility on a $5000 bike.