Vertical lines (similar to tire tracks) appear on the first page of a printout. When printing multiple pages the lines only appear on the first page. Single sided or duplex printing does not make a difference. I have replaced the drum cartridges (which actually caused the problem in get worse) and fusing unit. Toner is not low on any of the colors. Printer has been in use for 18 mos with approximate 19k pages printed. Any help/suggestions would be greatly appreciated.
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