Your laser/scanner assy needs cleaning. The main fan, located at the bottom is getting dust from below the printer and blows it to the lower (magenta) mirrors of the laser/scanner assy.
To repair, take the printer apart. Remove side and back covers. Then remove the metal frame with the boards. The laser/scanner is a black box behind the frame. Take it out and open it. Clean the mirrors.
To make the repair permanent, cover the fan's vents with sticky tape. I usually remove the plastic gratings to seal better. It will cause no problems to the printer.
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