Trek do seem good with their warranties. Someone I know had an old Fuel (10 years or so old),which developed a crack in a weld between the seat tube and top tube. Trek confirmed it was a write off and gave him a new Fuel frame under warranty. He then had an excuse to upgrade his forks, brakes etc as none would fit his new frame (as old bike had v-brakes, short travel SID forks etc). Expensive do, but still great to get a new frame under warranty.