How do I troubleshoot a malfunctioning air suspension in my Audi A8?

I noticed that my Audi A8's air suspension system is not functioning properly and I can feel the car riding lower than usual. What steps should I take to diagnose and fix this issue?

First and foremost, you should check the suspension compressor for any signs of damage or wear. This component is responsible for supplying air to the suspension system and may need to be replaced if faulty.