There is one controller board directly about the C and M heads, one above the Y and K heads, and one above the White head. So two heads plug into one board. So I turned the machine off, swapped the Y and K plugin locations, turned back on, did a test print. As expected,the Y and K heads were swapped in the print, BUT the black bar remained. So, is there some electrical problem with the ribbons coming out of the black head? I have more communication out to support, but they are in California, and I'm in Indiana, so communication isn't quite as quick as I'd hope it to be.
Any more ideas?