Thin Line at the Bottom of the Page in Brother Printer?

I have an MFC-LT6700-DW. I started seeing a thing line across the bottom of the page whenever I created a .pdf fine from the scanner. I assumed it was a problem with Adobe. But it shows up when I make a copy of something. I do not see any scratches on the glass. Can anyone suggest anything to resolve this issue?

Thin Line at the Bottom of the Page in Brother Printer?

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