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To the left of the skirt access door is a high pressure sphere which I believe supplies the jet nozzles.

I believe I've traced the tubing which joins the supply sphere and the pressure regulator.

Picture 2 of 4.

I believe that the large-diameter tube which goes straight up from the back of the sphere and in this photo turns 90° to go over the top of the door runs to the regulator. The mesh desiccant bags and desiccant which spilled out of the bags partially obscure this shot.