Been working on a J012 jam in a MP 5500. The j012 is a relay sensor jam. I have cleaned all sensor in paper path, removed and cleaned feed head bearings and sensors, replaced feed tires, cleaned feed rollers in the vertical transport, and removed the transport section with the bypass tray and cleaned sensors in it, before returning the unit to the machine. On most(95%) of jams the B gate will open and a sheet of paper will curl up just under the registration roller and IT unit. At this point I am out of ideas, please help. Thank you.
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