I Recently purchased a used machine that was set on 6-color and should have inspected it more closely. An expired ink cartridge was preventing them from doing a test-print. The machine looked clean and I took their word for it that they never had any problems printing until the tried using the expired ink. When I got it back to my place, I switched out the ink cartridge and then I could do a test draw. After a few custody washes and cleanings I get a good test from the CMYK side, but I am not getting anything from the light magenta/light cyan side. The dampers look like their full of ink, but the lines don't appear to be sucking ink. Could this be bad dampers, a bad head, or a bad suction device?