Although I have not used them myself, I've read all good and no bad reports about Essex Camera in many forums. They are apparently excellent.
Stephen, one place I have used is Sanford Camera & Video in Arlington. They did a CLA last year on my 28mm Nikkor and did a beautiful job for around $75. They are on Mass. Ave. and easy to get to from Route 2 as well. It would probably be worth your while to give them a call to see if they will service your cameras, they are an authorized Canon, Fujica, Hasselblad, Minolta and Nikon shop:
Sanford Camera & Video Repairs
1054-56 Massachusetts Avenue
Arlington, MA 02476
781-648-2505
Good luck!