My 03 E500 has 4 corner airmatic suspension. The car never sags, even when it's parked for days without driving so I'm pretty sure I don't have a leak in any of the bags. The car will raise and lower when I click the button. I can also feel the change in the ride between the sport settings and the comfort and the comfort with the vehicle raised and it rides amazing. Periodically the air ride malfunction light will come on, but everything seems to still operate fine. I also hear a clicking noise at all 4 corners of the car sometimes. Has anyone had any symptoms like this at some point so I know where to start trouble shooting?

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2022 Nissan Frontier Pro4x
1990 Mercedes 420SEL
1950 Packard 8

Previous German cars-
2001 Mercedes SL500
1983 Mercedes 300SD
2011 BMW 328i (manual)
2008 BMW 535xi (manual)
2006 BMW M3 (manual)
1980 Mercedes 300TD
2006 BMW 750i
1996 Mercedes E300D
1994 BMW 740i
2006 BMW 330xi (manual)
1999 E300DT Smoke silver/black 253k
2012 BMW 535i Xdrive M-Sport
1984 300TD-T 304k
1988 Mercedes 560SEL (parts car)
2010 BMW 550i xdrive
2017 Audi A4 Presitge
1979 300SD 313k
2003 E500 189k