The solution above is correct, but note that the marks are ON THE GLASS, not the part of the scanner that flips up.
Check on the flat bed part along the top. there are two white strips that go side to side. the top white strip is wider than the bottom strip right underneath it. On the thinner of the two strips, check for small black marks, can be very small. This creates a black line in the document. You can clean it with a fingernail & a tissue
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