It seems you have the printbar in the raised position which is good. It means that the cartridges are accessable from the ink cartridge door. At this point, normally you should be able to remove all the cartridges. I dont know why you can release the other 3 and not the cyan but here's some advice. Unplug the unit. This way you are not fighting to raise the printbar against any motor engaging the other way. With no power to the unit, you should be able to raise the printar all the way to the top by using a flat screwdriver above the cartridges as a lever. Once the cyan's bottom lip clears the opening you should be able to pull it out.
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