Seneca - Parking Brake Valve Position Signal

[Crossingover]

Where does the Equalizer leveling system physically get its permissive signal that the parking brake is set prior to extending the jacks? Is it a wire that is attached to the rear of the dash parking brake valve? I had the valve replaced recently and can't get that permissive signal anymore. So I'm thinking it was mis-wired when the new valve was installed. Thanks.

[Crossingover]

For those of you who may have opened up your dash behind the parking brake valve, perhaps you can help me find the input connection highlighted in the attached schematic. Backstory: The RV shop (La Mesa) recently replaced a faulty air pressure switch near the air compressor and now I can't lower the jacks unless the parking brake is disengaged. I'm ok with that as I can level with a chocked wheel, but would prefer to restore the permissive configuration. La Mesa has no clue what to do and I don't want to pay their diagnostic time. Thanks for your help.