As you mentioned you are getting a hint of yellow , Rest all in Black, Color planes are not printed . I suspect Main drive assembly gears not aligned properly as Drum drive assembly was reassembled by the technicians .I would suggest check this area because group of gears in the Drum drive assembly controls the color drum rotation and another set of gears controls the black Drum . Ensure that Main drive assembly Gear holes are aligned with one another .
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Please mark the post that solves your problem as Accepted Solution
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