I've been looking around for this for a while but I've been to find any info. When accessing the service menu on various bodies, there is a Camera Info.2 screen which shows the clock set count and the dates of the first time the clock was set as well as for the last time it was set. Can anyone tell me what the significance is of having the clock set date in the service menu and what the technicians use this info for when they check a camera for servicing? There is also another reading for RTC Read Err at the bottom which I haven't been able to find out anything on or figure out for myself, if anyone can tell me what that is. Image is an example taken from another thread on this site.