Have you check all the air connections with soapy water??
I had to do go through my air system in 2021, I had to replace all the Pressure Protection Valve, all four were leaking.
You will have to get the part number for you air bags.
I bought two spares to carry. bought them from TruckandTrailer.parts
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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