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I know it's supposed to be a 'Prolocker' query thread but just thought I'd put this here as my findings today would affect all air activated lockers I believe.
After last weekends debacle removed the rear cab seat for a closer inspection on @matfew 's upside down trackside correct diagnosis. The ARB solenoids were below the pressure manifold. Matfew whilst inspecting again on day 2 kindly ripped out the diffuser's which got some action back again. The manifold needs a full 180 rotation to have its drain bung lower than the solenoids and better maintenance by silly old me. Long story short, ripping the whole lot out now and remounting correctly up higher where it can be friggin accessed and adding an easy maintenance water trap bowl etc...