if it were the UK, it works as follows, i have had the misfortune to need to rely on it once.
Go to Shop, helps if you have proof of purchase, the warranty is for the purchaser after all
Shop will contact Trek frame gets sent to them.
They say yes or no to warranty. They might offer a crash replacement if the damage is user inflicted, i looked into this on my Top Fuel when i dented it but due to the time involved ( this was the year Trek never released a Top Fuel) and the fact i trashed all the components i just bought a new one instead.
New frame arrives.
In my case the Lemond frame was no longer made, there was no similar steel frame imported into the UK, so Trek through the shop gave me a choice of 6 colours and then sprayed a frame and fork and shipped it from the states. The fact the original frame was 525 and the new one True Temper Platinum OX, suited me just fine.
Took 8 weeks in all i seem to remember. Which from the day i noticed the crack to having a nice new frame and fork to play with. As yours is more recent and not so unusual i would hope that Trek carries a warranty frame in stock.