Coach Dumping Air after shutdown
Sorry for not updating this thread:
I discovered the problem was that my house batteries were only holding a surface charge. Shortly after shutdown they would discharge, the valve would open and the air would dump.
However, keeping the ignition key in the on position would prevent the dumping because the power was being handled by my starting batteries. The valve closes when the ignition is on so the air bags can fill for travel.
I subsequently installed new house batteries and have had no further issues. I hope this information is helpful to someone.
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