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This is coming from the Black Drum Unit. You may be able to remove the unit and look into the slot on the top. You should see the drum which is green in color and may be able to see the lines. Not much you can do with these units so you may just have to replace it.
Does this happen both when copying and printing? For printing solution, try another toner cartridge. If lines continue to appear when copying (primarily through the automatic feeder) then lift the auto feeder, and clean the glass -mainly the narrow piece on the left side.
Both sound like bad LCD panels. The following must be answered to confirm this: Do the lines appear on all inputs/all signal sources? Can they be seen in the OSD/menu? If yes to both questions, it is likely that the LCD panel is bad