A few months ago we acquired a Docucolor 252 refurbished.
Just now we've noticed the black ink is printing as a light gray although the ink levels are at 100% in cartridge 1 and 40% in cartridge 2. Changed the 40% cartridge for a new one and still no change.
All other cartridges are around 80% and the colors are printing fine.
We did have error 093-317 a few weeks ago that we resolved by following the directions here: http://www.justanswer.com/printers/5dbf6-dc-250-received-fault-code-093-317-aren-t-black.html
Currently there is no error on the machine.
Not sure if others have seen this issue.