Getting two solid evenly spaced lines on print

[GabiE-Xerox]

Replace the black drum cartridge.

[digitalprintplus]

and have cleaned the rollers i can see but same issue

[digitalprintplus]

Gettign two lines please take a look at print please

they seem liek they can be from a roller but I really don't know

They show up on both dark and ligth print both pics are from the same job

one is the front page the other the back 

back pagefront page, same space same place