try to check the one-way bearings of the roller pressure drive unit, there is a gear in the fuser compartment on the right, disassemble the pressure motor, (find it behind the fan at the top, 2 screws) try to do with your finger - back and forth fast, if you see that the bearing runs off, it means that some pressure is lost, and it is necessary to disassemble and clean them, if too much was lost you would see sc569
possibly disassembling the drive is not very difficult
regards
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