I have very good experience with the repairman from a little known shop: Camix, it is in the same building as the camera workshop. The repairman of his is very good in cleaning and repairing mechanical cameras. Especially in cleaning lenses he is simply the best i found soafr in Singapore and not so expensive too. Can however take long time as he has many jobs to do, so be patient.
Not so in the latest AF cameras however as he likely doesn't have the required equipment for some testing.
Hong Sien