It is from Cyan drum cartridge. Try first to swap the drums between them and if the issue is moving to that color replace the affected drum.
We have a Xerox Work Centre 7830 (not 7830i) wherby in the past couple of days we have a 1cm Cyan coloured band appearing at the top of the page, if we photocopy in black and white, the colour of the band is grey.
Up until this morning when I used the drum cleaning pull out we also had a large 1" band running verticaly down the middle of each page (see below images).
Any suggestions for cleaning or replacing any parts appreciated.
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