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The whole system is one air line in and it splits off via a quick release valve on each axle, which all 3 are daisy chained. When the system sends pressure to fill, if a tire has less pressure then its less resistance to incoming pressure and that tire will fill. If all tires had equal pressure...

I will look I have one somewhere. Yours probably isn't bad though. The wheel leak is causing the valve to see less pressure and it thinks it should dump. If you fixed the wheel leak the problem should go away.

The m939a2 dump valve looks the same it may work. I can tell you that they don't go bad often. A system air leak like a bad hub seal will mimick a bad valve.