Karen Nakamura (Photography in Malesia) and Wayne Cornell (a member) has mentioned with excellent ratings a Russian guy Oleg Kahlyavin. His "target" are old Russian cameras. You should ask Wayne Cornell if you are interested.
I have not read all the threads , so I might run through an old song.
He is hiding his light under a bushel but Chris Sherlock in Dunedin, New Zealand also repairs cameras. He specialises in Kodak and was trained by them as a camera technician. His website is at homepages.ihug.co.nz/~Srawhiti/index.html