I've used KEH several times for repairing my Nikon F2a's. The repairs were excellent, reasonable pricing and relatively fast turn around. http://www.keh.com/repair-center.aspx

Also if you want to send the work to Michigan, Midwest Camera repair http://www.midwestcamera.com/classic.html does excellent work, fast turnaround for pros and online estimates that are quite accurate.
http://www.midwestcamera.com/estimate.html They've done CLA's on all my equipment from Nikon, Leica and Hasselblad to repairs on my Nikons and Nikkor lenses.