2006 E-500 4matic air suspension

Question

I have 2006 Mercedes E-500 4matic.
My air suspension is not working.
Message that appears is STOP CAR TO LOW. Compressor works. No fuse is blown, replaced both K67 relays. Also replaced the manifold with valves. Still car won’t raise. There is no leaks either. Also I have disconnected the battery for 20 minutes as a last resort. Yet car won’t rise. Has anybody any tips on this issue?
Thank you.