Replacement Keyboard for Laptop?

I have a dell inspiron 6000 which is a little over a year old and has a 3 year warranty. I expect that in a few years the keyboard will be less soft than it is now and when it was first purchased. If I call dell to get a new keyboard, will they send me a used one or new one? Also, would they ask me to mail my whole laptop in or will they send me the keyboard to replace by myself? Thanks.