I got my Bronica s2a out of storage after 20+ years of retirement (the camera, not me), and it seemed to work fine for a while. After some 6 or 8 rolls of film it started to develop a problem, it appears to fire allright, but when I forward the film the two parts of the shutter curtain separate a little and by the time the shutter is fully cocked there is a gap wide enough to let light through to the film just above the mirror.
Does anybody have experience with this problem? could some informed DIY effort cure it? The camera is otherwise in a very good condition and it would be a shame to discard it.