When did you last get a good Cyan nozzle check? Did you visually inspect the cyan ink line to make sure there aren't any gaps?
Unless you let the printer sit for an extended length of time, it probably isn't clogged.
When a channel drops out in my mPower and it will not come back after a a few head cleans, usually running a 20 second print line fill followed by a print head clean all light will bring it back. If you have been running lots of print head cleans to try and get it back, I'd let the printer sit for 30 to 60 minutes and sometimes it will come back on its own.
Another thing you could try is to moisten a lint free cloth with isopropyl alcohol and then hold it flat against the cyan/magenta print head for 60 seconds. After that I would wipe the print head back to front with a lint free cloth moistened with cleaning fluid.
Eric