Thanks for posting your question on Justanswer.com, a global paid independent support site.My Name is ***** ***** I will be assisting you today. Can you describe the marks ?
Please open the printer cover and check inside the printer with a flash light for any ink stains on the parts.
This can be caused due to leak cartridge. Please remove the cartridges and then clean them with tissue and then, reseat them. do not rub the tissue, just pressed the cartridges.