MFC-7460DN Smudges of Ink Appear When Printing?

Hello, MFC-7460DN. Smudges of ink (about 2cm in diameter) appear when printing, in regular intervals vertically along the page, about 6 per page. Replaced toner, replaced drum, opened front and back covers and cleaned everything in site. No change. Any ideas? Thank you!

MFC-7460DN Smudges of Ink Appear When Printing?

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