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PAU means that the dryer thinks the door has opened. That means you either have a bad control board, or the door switch has failed. You'd need to take the dryer apart and test the door switch to know if the door switch is good or not using a multimeter, but if the door switch checks good, then you need to replace the control board
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I don't know who is in your area for service unfortunately since I'm out of Colorado, but the board is no longer made which means you'd have to get a refurbished board which is about $160 or so.