What is causing this printing defect? HP452 - Black lines/smudges down middle

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Nov 29, 2023
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I would appreciate any help. I have exhausted all HP help. I have an HP M452 printer. All prints have repeatable black lines/smudges running down the middle. I have inserted a print in this post showing the defect. Does anybody have an idea what is causing this and what is the fix? Thanks.
HP M452 Print Defect JPG.jpg
 

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