Oki C9655 colour A3 laser printer with repeated cyan marks on the prints, the issue was caused by the photoconductor unit also known as the drum unit, this had a score mark on the shiny surface and it was causing the drum to pick up excess toner on every turn, The Oki part number for the cyan drum unit is 42918107 and this should have a print yield of 30000 prints, paper feeds and LED units cleaned, now producing perfect prints.
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