Actually, Diane, I have 3 Bronicas (it's a long story, but let's say evilBay is just that...an evil temptress
). I have an ETRS, an SQA and an older S2A. Leon has an SQA too and is very much the 'go to guy' for anything technical on that front (his pictures speak for themselves) and I'm sure others here have one or more cams from the various Bronica MF ranges. I know Susan B used to own an S2A, but I'm not sure if she ever took it apart.
Personally I'm a bit of a fool when it comes to the technical side anything over and above a toy camera so I can't be much help on this occasion. I will however open this up in a separate thread as I'm sure some of the other Filmwasters will be able to help. The good news is that the S2A doesn't have the shutter in the lens as with the SQA and the ETRS so any cleaning tasks will be exponentially simpler (I'd have thought) as a result.