Sleeper air bags

[earnies2]

Ok this might sound stupid but here it goes.

I replaced my cab air bags/struts a couple of years ago.
I was doing some work to the truck and noticed my cab was down. I had a new leveling valve so I installed it and no change but the old valve was bad and not sending air to the bags. Now there is air going to the bags the bags are hard but not lifting the cab. Is there a difference in the bags for a skyrise cab? If I put a 4x4 and a jack under the cab and lift it up until I heat the valve exhaust the bags will go up as soon as I let the jack down they go down. There are no air leaks.
I'm stumped
Today I traced the air line from the valve it goes to a line off the air dryer that goes to the solinoid block. It's a ¼inch yellow line. I'm wondering if this might be a reduced pressure port.