I had error E085 after about 10 minutes of printing . Every time I tried again I will get same error at about same percentage of print. It means abnormal condition of head driver. Error suggested it could be cables, head or main board. After I have reinserted cables I would either get error right away when I do test print or it would print long magenta stripe across test print. It was one magenta channel that would print long stripe. Rest of colors were ok. So I decided to buy new head and cables. After I have installed new head and cables, I have tried test print and same magenta channel is completely missing. No stripe just nothing coming out of magenta channel. No errors. I have checked all the fuses and transistors on main board, but everything seems ok. What do you guys think what could be the issue?