Any advise would be appreciated my canon 3180 has started producing a thin black line on all output? it always appears on the reverse side - only recent change was a black replacement toner (genuine canon) machine is probably due an ITB cleaning unit but would this cause a black line on reverse side? drum is recent change only 6% used,black dev unit is on 13% - the line does sometimes appears in different places on the page - but is always on the back of copies.

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