Good afternoon guy and gals. I inherited my brothers TBSS after he passed away in January due to covid. I haven’t been able to get myself to drive it much but I’m getting where I need to drive it as that’s what he would’ve wanted. He did daily it but there’s some issues with it that I’m trying to address and get it fixed. It has a few codes that I done pulled and I’ll get them addressed but the main thing I have no idea about is the airbags. They won’t hold air up automatically, I have to manually air them up and they don’t hold air as they should. I know maybe a year or 2 ago my brother changed the compressor but that’s about all I know. What do I need to do to fix this issue? Or maybe change it to a coil spring? I’m new to the TBSS world. I have a SVT f150 Lightning, so it’s very different from this. Any help or insight is very much appreciated guys.