Ronmar
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Yes the top one under the drivers floor with the switch is where the front red glad-hand and air from the park control combine to feed towards the rear. That switch controls the park and emergency lights in the dash.. the lower two valves tied together are blue service glad-hand input to the pri and sec brake systems.
so I wonder where your park control in the dash gets its air from. on the A0 there is a 2way above those floor bulkhead fittings. Straight ahead of your left shin when seated. Where does your gauge box sense pri and sec air? At any rate the 2way that delivers park air to the dash control wouldnt be the cause of a leak, it would be the output line from that 2way or the lines and park control that you have already gone thru.
so I wonder where your park control in the dash gets its air from. on the A0 there is a 2way above those floor bulkhead fittings. Straight ahead of your left shin when seated. Where does your gauge box sense pri and sec air? At any rate the 2way that delivers park air to the dash control wouldnt be the cause of a leak, it would be the output line from that 2way or the lines and park control that you have already gone thru.