I have a Roland Soljet Pro4 XR-640 printer and have been having problems lately. I have attached a picture of a test print for reference. Large amounts of magenta are missing in the test print of the A head and some of the colors appear to be smearing. I have done several powerful cleanings, medium cleanings, normal cleanings, and manual cleanings with no improvement at all. I have also replaced dampers in that head as well as cap tops. I would like some advice on what to try next.