[rheavn]

If that was my coach all push in connectors would be replaced with DOT compression fittings.  I have not had a single dot compression fitting that I installed start leaking.  All of my air shut off valves have been replaced due to leaking.  And any component, like the air block, would be replaced once it leaked.

The push in air fittings are a time saver for production, but seem to start leaking after a few years of use in a coach environment.  Prevost owners have the exact same issue and also recommend replacement.

Good luck....................................