Hi, thank you for jumping in, this is so stressfull.
I printed the step pages like you said, the magenta has black in every step. I reset the printer to factory yesterday, printed all the fill pages, step pages adn anything I could, just issues in magenta. Even the config page where there is magenta prints dark, so Its not a driver issue or with my adobe programs iI am printing from. I have uploaded a few pics of what I am talking about. You can see that the cyan and yellow is fine, no issues, the magenta is dark only.
The issue started when I was having a lot of lines in the black prints. iI replaced what was a new IU with another New IU, and not only are the lines still there but right after that the magenta printed dark. I have also uploaded a pic that shows a print that I was doing, red was fine, and after you can see to the right of it a print after of same file with the red darkened. I have no more IU's, I just wasted 2 of them and they are expensive so I cant figure it out. If it was the fuser or roller iI figure it would be on all colors but it is not.