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All leaks in the EAS system must be found before any of the EAS Fault codes can be used. I would guess that you have some worn air springs or a leak in one of the oring junctions. The fault that you are experiencing is usually never a stuck valve, but almost always a leak in the system. What happens, is that the EAS computer triggers the valve to raise a corner. When nothing happens over a period of time, the EAS thinks that the valve is stuck closed. In reality, a leak in the system has depleted all of the air pressure and that is why the corner is not moving quickly enough.

  

Find the leaks first.