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Assuming that the print comes out portrait-wise (short side first) I would say worn drum/cleaning blade/developer. Drum, cleaning blade and developer should be changed according very specific instructions otherwise you will be confronted with a C-2557 service code. Time to get a tech to do it for you unless you are familiar with MFP's yourself but you still have to follow instructions carefully. There is a plethora of information in this panel about that. Here's some:
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