So I am on my 3rd front remanufactured shocks back to back, different brands Arnott and latest are Suncore (both front shocks every time).
Only the front right side is still sagging over night, I sprayed foaming liquid on the line and the air valve, no leaks.
I kept thinking it's a defective shock but after trying 3 different ones it's pretty obvious something else is leaking.
Is it possible for diverter valve or valve block to leak? What is the best way to test the system? I do have a smoke machine....
Sorry for silly questions, this is the first time I had to deal with air suspension problems ever.
My car is 2011 Supersports with 30k miles.

 

I had the same issue on my 2009 gtc. Replaced the front end and one strut was defective. Luckily arnott had a lifetime warranty through my installer.

Very disappointing to have to deal with multiple times.

I believe a smoke test was part of the leak confirmation.
Good luck!