I recently acquired a cute little Mamiya 135 EE. Shutter works fine and lens seem clear. There is a corrosion in the battery (still have not tested it with a new battery) and some smudge (oil?) on the aperture blade from the inside. Can someone recommend a shop/person who can do the CLA? Also I did not seem to find much on Mamiya 135 EE - are they considered to be good performers? Thanks!