Hello indpress,
I see no one has responded to this post yet. So, at this point I would recommend contacting your local Xerox Support Department to speak with a Product Specialist for more assistance. Please call 1-800-821-2797.
On a run of 100 sheets 7 have deep magenta lines across the page usually 1/4" sometimes 1/2". Near the end of the run and not consecutive sheets.