The most active mechanical part is the ride height valve(s). I've already replaced one. With the coach aired up and the engine running, can you hear the valve(s) leaking. If not, stop the engine and see if you hear a leak. With the bags dropping that fast, one should be able to find the leak pretty fast.
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Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
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