My Continental GT is leaning to one side like it's tired of my driving

This is such a weird one. I've got a 2018 Bentley Continental GT V8, and I noticed this morning that when it's parked in my garage, the driver side rear sits about an inch lower than the passenger side. But after I start the engine and drive for a few minutes, it seems to level out again. I checked for air leaks around the bags with soapy water and didn't see any bubbles, so maybe the compressor is weak or there's a slow leak in one of the lines? I'm not an expert on the air suspension system but I know these cars can get expensive fast if you ignore things. A friend who used to own a Flying Spur mentioned that you really need someone who understands the Bentley electronics because even changing a shock absorber requires calibration or the car throws warnings. I was looking at https://suspensionrepairdubai.ae/bentley-shock-absorber-replacement/ and they claim to come to you with the diagnostic tools and can do everything on site, which sounds way better than towing it to a dealership and getting a bill that makes me cry. Has anyone here had air suspension work done on a modern Bentley by a mobile service? I'm specifically wondering if they can pinpoint whether it's the bag, the line, or the valve block without just replacing everything. Also curious if they carry parts like struts on the truck or if they have to order them and come back another day. Really hoping this isn't a sign of something major failing.