How do you tell normal air suspension behaviour from a failing system?

[dominictoretto]

I've had my Ghost for about two years now and I keep noticing little things that make me paranoid, like the car settling slightly overnight or the compressor running for longer than I remember. It might be totally normal but I've got no baseline to compare against, and I don't want to be the guy who ignores a warning until the whole system packs in. I found a page on Rolls Royce suspension repair and hit see more to read the full breakdown of symptoms, which was actually quite useful because it listed things I wouldn't have thought to check. But I'd rather hear from actual owners. How do you distinguish between the car doing its self levelling thing and an actual leak? And is there anything you can check yourself before booking it in somewhere? I'd rather not pay for a diagnostic if I'm just being overly cautious about nothing.