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2004 Chevy Silverado Locks

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I have a 2004 Chevy Silverado 1500. The door lock on the driver side rear works sometimes, the driver side works sometimes, and the passenger side front does not work. I replaced the actuator on the passenger side door and that didn't work. I've had this door fixed for this problem many times when it was under warranty from the dealer. Now today all door locks worked for a couple of times and now its back to the old problem. The door lock on the driver side rear works sometimes, the driver side works sometimes, and the passenger side front does not work. Also, the driver door and driver rear door locks sometimes when you put it in drive and then unlocks when you put it in park. This is driving me crazy. Does anyone know what is going on with this? and how to fix this?

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