Mine had a new compressor which was good for a couple of years until it started the long delay to start cooling and then it started reducing cooling to mildly cool in hot weather, but cooled properly in cooler weather. I had a new valve installed, which didn't fix the problem and when I got it properly checked out a few weeks ago the gas was contaminated, requiring the major rebuild to fix properly. The other 2010 D4 that was being fixed at the same time as mine had exactly the same issue, a new compressor and then new valve with the problem persisting. Apparently they also did another one in the same week with the same issues.
Hopefully your new valve does the trick for a long time and saves you a heap of money.
My RH rear door open sensor has now got an intermittent fault, causing the alarm to go off randomly. The bonnet open sensor is also faulty but I have disconnected that thinking it would fix the alarm. However, no such luck. They are the first electrical issues other than the rear hatch catch to go wrong. I am now driving with no EPB, no air con and I can't lock the car. That is how it will stay for the foreseeable future!!

