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Had a similar problem with a MX5001 and it was due to a cleaning blade flipping on the black drum. It would jam in the same place everytime and give a PPD2 code. Take out the primary transfer belt and look at your drum units to see if any of them are covered in toner.
This is a late reply, but for general info: the PPD2 sensor seems to fail a lot more frequently now than in the past; even though the same sensor is used in everything from the old ARM450 up to a Hercules. Often the sensor will test good, but still cause you problems.
One trick is to activate the sensor for several seconds instead of just doing a momentary test. You will sometimes see the state begin to switch back and forth.
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