[Frankie4Fingers]

could be bad leveling valves or could be air bag issues. I Own coach 480  and have had to replace all of it due to the same issues.  I can try to walk you thru some troubleshooting if ya need help, just pm me.

Tom helped me.  I did find that it only happens when I level the coach and not when I am in travel mode.  The "supply" air does drop over time no matter if I level the coach or not so there is a leak somewhere for sure.