The M9 is now an ancient, long-obsoleted, first-FF Leica M camera. When I had one, I was never all that taken with it ... It exhibited many of the issues of a first product with difficult technology to develop: slow and unresponsive shutter release, too little pixel resolution on a too small LCD, et cetera. When mine exhibited the corrosion issue, I was glad to trade up to the M-P 240 model, which has both a far better sensor AND proves overall a much more competent, responsive, reliable, and consistent camera.
Posting such "shock and horror" photos and stories of a camera that even Leica has admitted had a lot of problems more than half a decade after its first far more competent successor was introduced and released is just an overweeningly ridiculous snore to me.
G