[Tfrazier]

Hi Chris,
Thanks for the reply. two of the tanks have petcocks and one has a pin that you push to drain. No water in any of the tanks. I have looked in every possible cavity or opening where a tank could be. The two with the petcocks are just forward of the fuel tanks and are pretty close to one another. All three tanks are the same size and oblong in shape.

I searched the overhead cabinets on the drivers and passengers side for the air horn solenoid. I removed all of the panels and covers but didn't find any air lines or anything that looked like it was associated with an air horns. There is a flat screen between the cabinet doors so I suppose it cold be behind the TV. I'll look tomorrow.

I built a leak down tester and I watched the videos on how to use ut. Still not totally comfortable on the process but will start that playing around with it tomorrow.
Tony