A rainbow line of colours appears down side of paper from time to time. I believe this occurs after the printer has configured. How can we stop - our service engineer for office equipment had no idea!
It sounds like your having a fuser issue. Look at the lower rear side of the machine for the door. Remove the door by pressing in on the lower left tab. Remove the fuser to view the rollers. If the rollers have melted toner on them, that's your problem.
Hope that helps ya.
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