I talked to the owner of Chronotek at a GTG with forum members in Baltimore. He said he can service Airman.
Chronotek Inc
123 East Broad St
Souderton PA 18964
There's supposedly a guy in Bangkok and a guy in Denmark who also work on them.
Any idea who the guy in Bangkok is? Ronald Prins in the Netherlands is also very good, he serviced 3 or 4 of mine.