As moa says, they will repair your LeatherMan tool if you send it back, but not forever. The warranty period on most of the models, at the time I recieved mine (December 1997), is 25 years. To determine the manufacture date of your LeatherMan Tool (and thus the length of the warranty), look at the place that the blades fold down onto. There will be a number in the MMYY format. This is the date of manufacture.
The LeatherMan also works very well as a roach clip and for starting cars for which you do not have the key or the key does not work. (Insert medium screwdriver in lock, twist hard.) Much cheaper than just replacing the lock, and that way, it's not a concealed weapon.