I spent the afternoon with the President of Badger at Huntsville last October. He confirms that Badger will repair and recondition, free of charge, any of their airbrushes. I can confirm this to be the case, since several of the members of our club have taken advantage of this service over the years.
BTW, Badger's new Renegade airbrushes are excellent. I bought a Velocity and love it. More here.