Hi- my 1990 300te wagon has the self leveling (hydropneumatic) rear suspension. The ride in the rear is very stiff/harsh- feels as if shocks are not functioning. I googled this and found that almost always the cause is bad air cell accumulators in the rear and that the shocks themselves seldom go bad. The air cell accumulators are only about $100 each. My local MB dealer said when I called to get an estimate on labor said " gee- its-been a long time since we did any of those"- didn't have any idea what it would cost and then said "maybe 400 or 500 dollars labor"- I called a few local "import specialists" who had never heard of this part either. Can anyone descibe where they are on the car, how difficult they are to replace (like- do the shocks also have to come out, and do you have to bleed anything after replacing them, etc. Thanks for any help you can provide.