Ok so recently I noticed the RRS darting slightly when hitting bumps etc in the road and thought it might be tyre pressures. All checked and fine. Noticed compressor sounds noisier than I remember but only had the car a few weeks. Also now notice car sits low at OSR. So, I have a decent warranty with the car so do I get it looked at under warranty? (Max £2k per warranty claim) or is it something I can sort myself relatively easily ?

Cheers Present-2008 RRS TDV8 HST
Present-2018 M4 Competition Pack limited edition in Riviera Blue
2017 M4 in San Marino BLUE
2016 M4 in Austin Yellow
2009 RRS TDV8- Alive tuned
Mitsubishi Evo X RS
Mitsubishi Evo 9 GT

Welcome to the inevitable for all L320 RRS owners. Sounds like time for a new compressor, and/ or air struts, and/or valve blocks. Happens to all of us, let your warranty handle it. Vincit qui se vincit

So, warranty company said they won't cover the air suspension on the car. !!! The garage I bought it from sent me a new compressor which I fitted but it made no difference. I reckon the compressor I Tok off was pretty new and the new type not the original Hitachi model.
I then went around the positions sensors and found the rears very crusty and one was seized at the top part connected to chassis so I freed all of them up with wd40.
Car suspension works, is slow to operate sometimes but eventually does adjust but sitting low at OSR still. The indicator on dash for the suspension shows that corner is different to the rest so I reckon its a recalibration required as I have no other faults. Now have to try find someone who can reset it all.
 Present-2008 RRS TDV8 HST
Present-2018 M4 Competition Pack limited edition in Riviera Blue
2017 M4 in San Marino BLUE
2016 M4 in Austin Yellow
2009 RRS TDV8- Alive tuned
Mitsubishi Evo X RS
Mitsubishi Evo 9 GT