Get into MENUS, go to DIAGNOSTICS, PQ TROUBLESHOOTING. Check the cyan.
Clean the contacts on the cyan cartridge, replace the cyan cartridge, Replace the High Voltage Board. The laser scanner for that color may have to be replaced. The DC Controller could be bad.
Also, under DIAGNOSTICS there is a "Disable Cartridge Test".
That test will allow you to remove all the cartridges and swap them around(in other words, put the cyan in the black slot and the yellow in the magenta slot) and print. So why don't you run that test and swap the cyan and the black. Print and see if the problem follows the cyan cartridge. If it does, replace it. If the problem stays with the original slot for the cyan, then the stuff mentioned in the first paragraph comes into play and you may need a tech to look at it and replace parts.
Good luck
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