Aerostich sell a zipper repair kit but if you've lost a lot of teeth, or worse, it will need replaced. I think they did a zipper upgrade to a more waterproof one which was either free or at cost. Chris has sent his Roadcrafter over to Aerostich for repairs in the past, I wouldn't trust anyone locally, I have had local seamstresses and leatherwork guys work on zips for me in the past with little or no success.