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Hi, my name is***** fault code and the symptoms would point to a bad suspension valve block. If the valve block is not functioning properly it can cause the suspension to drop and also cause the suspension not to fill up. It's possible that the rear air springs are leaking but normally when the springs leak they leak consistently, not once every couple of weeks. I'd recommend having the rear air springs inspected for leakage first. If no leakage is found I would inspect the wiring to the valve block. If the wiring is okay I would go ahead and replace the valve block.
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