[Man-O-War]

First check to see if your "EAS lock" is on (the light on the round EAS control button). If that's not on, then you seriously have to look at the FL airbag, as those are classic symptoms of leaky bag. I have had exact same problem with FR bag, and it finally ended up needing the airbag assembly. Even though it rides great now, I am still thinking about converting to coil springs and calling it a day. Good luck and please post further developments

 

[Man-O-War]

I was getting articulation fault code, and it would lean on FR corner. Sometimes it would sit perfectly level and even for 2 days in the parking lot, but as soon as I get into it and drive it it would lose pressure in FR bag. I tried installing used airbag, but that one leaked too. New one fixed it. Hope this helps, try soapy water first, and maybe even spray some tire sealant into the airbag (make sure you inflate the suspension immediately afterwards before sealant sets).