Robert,

I just replaced my regulator, it's made by Mac and you can adjust the pressure in or out. My problem goes beyond the regulator and I have a bad air cylinder that leaks air out the exhaust of the regulator. I have temporarily plugged the lines off until I can figure out how to remove the cylinder. I tried to go through from underneath behind the bumper, but can't get to the mounting bolts. The step is mounted on a slide out tray, but there seems to be no way to remove the stops allowing you to remove the step.

We're just sliding it in and out manually for now.