The warranty is suppose to be honored by all licensed distributers and their agents, meaning where ever you bought it. If you have a receipt any store that sells them can exchange it. If you bought it online the online store should have records of the purchase but unless you do regular business with them they will likely want you to send it to them at your expense and then they will ship you a replacement. If your LFS sells them and you do any regular business with them they should exchange it for you regardless of where you bought it. It will cost them nothing.