I can tell you horror stories I have experienced with amost ervery camera maker.
Here´s the last one (mid 2006):
I have an good mechanic, who can even make spare parts for Hasselblad shutters. The one thing he fails is to clean a lens. So I sent my CF 150 I bought in 1988 to Zeiss in Oberkochen for cleaning. The lens is overall in almost new condition, but there was some dust in it reducing the contrast as soon as you took a picture against the light. A got an offer over EUR 1000,-: shutter out of tolerance. Must be replaced. I called them and was told the exposure times were not ecaxt. I said I don´t mind, I just want the lens to be cleaned. I got the lens back some time later: perfectly clean, EUR 195,-. I was happy. Some time later I got a job for a financial magazine for a portrait in square format. A good occasion for me to leave my Pentax 67 at home and use my Hasselblad. The light in the old beer brewing hall was very dark, so I asked the pretty famous beer brewer not to move. The guy was 63 years old, old scool, and managed the job very well. Some hours after giving the films to the lab the staff called me: there is something wrong with your films. They were all streaked. I took me long to understand what happened: the shutter hadn`t closed after the 2 second "B" exposure. With times from 1/500 to 1 sec. the shutter is closed automatically. With "B" taking the finger off the release will activate another little twist of the steering coupler to close the shutter again. The shutter of my lens didn`t close again. The helping shutter of the ELX will not snap back after the exposure (that´s different from a 500CM and 501 CM). Instead the motor would wind the film with both shutters open. They are finally closed at the end of the cycle when the lens shutter is cocked again. I almost lost my reputation with my client, but managed to retouch the streaks in a one day session. Afterwards I brought the lens to my old mechanic: the shutter had been reassembled the wrong way after cleaning. But he told me it is in perfect condition, no need to replace it.
I just bought my first digital back now, and guess what I will do next month: send my 60 and my 80 to Zeiss for a clean up.