Made a file to test this. I can replace the color on the RIP to test different colors. At this point I am leaning towards printhead failure. I tested a purple with CMYK and CMYKcm it made no difference so I would lean towards yellow/magenta printhead failure. Both head around 4000ml. I will test again when I replace them. The light gray color deferential shows with CMYKcm but not with CMYK, but the lc/lm head only has around 2000ml through it. Will test again when I change that printhead. Nozzle test prints fine on all printheads so it just might be I need to, in the future print this file to get a better sense of printhead performance.