Newell Gurus

Trying to figure this one out.
The left front drops especially in cold weather. But when I try to raise that side it takes a long time or doesn't come up at all. If I crank the engine to let it come to ride height that corner takes a long time also.
But if I press the raise button on the HWH pad to raise it to the extended height it comes up quicker. Doesn't that button use the same solenoids? Why would it work quicker on that button?
I'm thinking it is either that raise solenoid not working or leaking.
Any thoughts?

Did you make yourself one of the air system isolator testers? If not, make one to insert between the six pack and the suspension. Air it up, then close the isolation valve. If it stays up, then it is likely the solenoid. If it leaks down, the problem is downstream from the six pack.

Yes I made up one when I was at Steve Bare's. Just haven't had the time to work on it.
I'll try and get that done before we leave out in March.
Gotta reglue the basement doors, wax the coach, change the oil, blah, blah, blah........