We fixed one by replacing the long belt that drives tray 3 (left side LCC feed). It was slipping and you could barely hear it once in a while. Never liked those things.
Also, the guide bar that holds the pinch rollers against the lowest vertical path rollers of the main engine cube was modified. It used to be made of a clear plastic that kind of flopped around and warped. The replacement one made of grey plastic was better. May or may not be related.
The vertical path door on the left side also had silver pressure springs applying pressure to the white vertical pinch rollers. These were modified and the new style has a black coating on the springs. Stronger tension. You can try to hold the door in with your hands while operating it if it is a frequent jammer. That might lead you in the right direction.
3-tray desks were much more reliable.
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