Technically your dealer could repair it but for the hassle of returning, the wait, etc, it's not worth it.
[EDITED POST]
I'm assuming you're talking about the chrono second hand. I'm no watchmaker...but it could possibly be something simple or more serious than just not being seated in the cannon pinion properly.
The problem could come from a number of areas. In it's simplest form, it could be that the second hand is just not seated properly in the cannon pinion. This is a quick fix that merely involves pressing the chrono second hand back in place properly. You could take it to any local watch repair guy in a mall or whatever, tell them you have a rep and that you need the second hand pushed back on. It will take all of 20mins tops, and won't cost a lot. Or, you can try and to it yourself.
In it's more complex form, the chrono second hand or the cannon pinion are malformed and need some kind of adjustment. It's possible the second hand might need to be glued...and that will take more time...and I would suggest you leave that to a repair guy to do if this is your first time working on something like this.