This 4345 with 150K on it will throw a paper stopped error in the upper print area. It is always in the same place, same error code. It will run smoothly for 10-15 prints and then jam. There is paper halfway through the fuser, and about two inches of blank paper coming out of the registration unit. The jam is always exactly the same. We have blown out all the sensors, changed fuser assy, changed duplex unit and all feed and separation rollers. Nothing matters. We've done the manual sensor test, everything is fine. All sensors work correctly....until you run it. Does anyone have any idea what this could be? I'm stumped.

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