Well I thought I had seen the last of dropping Airmatic suspension when the s class went and since owning the E 55 I've admired the way its sat even after a week or so unfortunately the last time I took it out I noticed that the rear looked a little lower than normal which gave me the Stop car to low warning on initial start up, wait 20-30 seconds and all's good again. I know that the previous owner had both rear struts replaced within the last 12 months with genuine Mercedes items as I have the invoice to prove this. I drove to Birmingham on Friday and about half way through my journey I had a message displayed stating Visit Workshop and a car with an up arrow on dash, I stopped at the services for a coffee and the car was sat at its normal height, return journey was fine and no issues but noticed this morning that the car was sitting slightly lower than normal. I was thinking Valve block but am a little uncertain on what to check first. I suppose leaks at block but am a little uncertain as to were its Located. the cars a 55 plate e 55 amg. Thanks.