So bought a DII about 3 weeks ago knowing it had rear end sag. Was bad enough that in the cold weather in about 4 hours one side was all the way down. Soapy water test revealed leak at connector on one side and leak in bad itself on other. Didn't drive it but ordered two new air bags and put them on this Friday. Initially thought all was good as I could tell after 3 or 4 hours seemed to be holding. Well been about 36 hours know and I can tell its dropped a good 3 or more inches and looks like one side maybe a little more than the other. I sprayed some soapy water again and got no results.

Now assuming is bad but first thought is the air bags are probably ok so suspecting the air supply connectors a little. The new air bags are the quick connect style so had to cut off the screw in fittings. The seem to be in place ok but a slight wiggle and you can release air pretty easily. Are they suppose to be this loose or what did I miss on them? Don't think I can press them in any farther. I know I could leak somewhere else in the line (or connector at compressor) but havent tested those just yet.

 

They need to be air pressure tight which it sounds like your's aren't, so I would call you supplier for help.