My Phaser 7750 has suddenly started telling me to replace the Cyan toner cartridge when there's at least 50% left in the cartridge. I thought it might be the cartridge, so I put another one in, same thing. If I pull it out and put it back in, it will sometimes (but not always) reset itself and print about 10-15 pages then quit with the same "replace Cyan toner" message again. If I need to replace a part, I have two "dead" 7750s I can take parts from, but might need a little guidance there too. Thanks.
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