Our 2007 C61800 has been working fine. But now, without warning, two of the 6 ink cartridges have stopped printing. New light cyan and cyan cartridges have been installed to correct the problem, both are showing up as FULL cartridges on the computer display, but test pages and prints show no indication that the two cyan ink cartridges are outputting during the printing process. Any suggestions for how to improve this situation would be appreciated.
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