air leak problem

Freightliner XL chassis, 2002 Newmar Kountry Star...air leaks down to 0 on the dial in a few hours, yet it was not sitting low when I went to move it. I can hear an air leak underneath in the right front area along with a little noise every 5 seconds or so, sort of like a small squeaky noise.

I assume the air bags are still full since it did not seem to be sitting low.

Tomorrow I will do the soap spray, but and ideas of what I should be looking for?

Ron