I have a Workcentre 7220, it started printing green pages when you used the doc feeder or top glass, sending faxes and prints from all other means printed fine. If you have this problem update your firmware to 073 version, my copier had 072 before, this fixed it on mine.
And if you are still on a 072 version now, upgrade with the tool because the 073 releases that replaced the 072 releases started in 2015, so you are upgrading by more than 27 firmware releases as of today, that is too far for standard upgrade procedures to be safe (not impossible, just not safe)
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