Valve under fifth wheel is leaking air

I have a 2019 T680 Kenworth hooked up to a double bunk log trailer and the valve under the fifth wheel is leaking air out of the plastic plug on the bottom of the valve when the red button in the truck is pushed in. The valve doesn't leak air when the red button is pulled out. Also, air leaks out of the yellow button when it and the red button are pushed in.



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