Change the Interlock switches above the fuser. They will give a jam indication with no location. Also change the seals between the dev init and PCU then lock the two units together with a self tapping screw. This will stop toner blowing onto the optics / laser and interlock switches.
Before you change them, check the wiring sequence of these switches on the point to point! If incorrect, the machine will not reset after a jam and will require a reboot.
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