George,
I found this on memory compression, what it accomplishes I will have to research further.
https://www.ifixit.com/Guide/Nikon+D...placement/2098
Something that digital photographers seem to forget is that back in the film days, when cameras were much simpler, they went back to the shop once every year or two for a cleaning.
In the days where we would upgrade our camera bodies every three years, that is a step we forgot about. Now that the incentive to do so because the quality gains between two (and even three) generations of cameras is so incremental, we tend to hold on to them for longer periods and sending them back for a cleaning makes sense.
Unfortunately, the day of the independent camera tech is long gone, so the process involves sending the camera to an authorized service centre at a much higher cost as these centres don't have any competition.
With respect to the link you posted, that is just about 100% useless. Fine if you have a scrapped camera to salvage replacement parts from, but that also means you need to know why it needs replacing. The Nikon camera techs will run a diagnostic on your camera and replace components that do not pass the diagnostic. The name of the component may or may not be of any use trying to understand what was wrong with the camera.
Manfred,
Only posted the link as I was trying to figure out what was done to the camera, I checked the Nikon website and there weren't any hits on what memory compression was. The firmware update didn't mean anything to me either as I'd already done so months prior and had checked for updates prior to sending the camera in.
I spoke to a Nikon tech when my camera was in for service and this is just their standard protocol. While you had updated you firmware, many people do not. Even if you have, something could have gone wrong so by reinstalling it they know they are working with "clean" firmware and can trust the diagnostics from the camera.
Those darn diopters . . .
Zen