Buying a used M9
I'm looking at buying a used M9, looks to be in pretty good condition. The sensor was replaced by a local dealer in July of 2017, shutter count is 11500.
If I understand correctly, the July 2017 sensor should be a good one, so I don't have to worry about corrosion. 11.5k on the shutter seems low, so I don't think I need to worry there.
What should I be checking when I meet up with the seller to confirm that this is a good buy?