As title suggests, when printing one side, the print is clean as a pin. When duplexing, lines appear at bottom of page (operator's side) in white area (see pics). When first seeing it, knee jerk conclusion was drum. But seeing it isn't marking on first side, it looks that it has to be something else. This is the first time I've encountered this oddity. Thoughts?
SideA Clean.JPGSideBmarked.JPG
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