Air Dump Valve location in 2004 Journey 39K

[jefflbi]

I'm troubleshooting why the air dump button on my leveling control panel no longer dumps the air. I have voltage going to the leveling control circuit board and the fuses are good. I want to check and see if there is voltage at the dump valve, but I have no idea where that is located or what it even looks like. If someone could point me to the general vicinity or can post a pic, I'd appreciate it. TIA