Honestly I'm so comfortable with these document feeders I would just do a complete teardown just to make sure that there are no Staples stuck on any of the transport rollers.
The first thing I need to ask is is it a real jam or a ghost jam. For example the sppd2 sensor, this paper did it reach that sensor or no?
If it reached it but it gave a not reached jam code then it's quite obvious that the issue lies with the sensor itself. If it didn't reach it, might be a timing issue. Nevertheless, 99% of the time when it's not a stuck staple or a worn roller, it's always a photosensor.
I've replaced... Countless photosensors, they go bad often.
And yes they are often intermittent. Don't forget to update the firmware.
**Note** I'd had like one or two occasions where there were Staples on the board and they were causing shorts, might want to check that out too*
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