Bamba,
One thing to check is where the linkage connects to the torsion bar (I think that's what its called). There are two small bolts that hold the linkage in place. If they come loose, it will give you symptoms similar to having bad accumulators.

Mine would be working fine, I'd put some weight in it and the back end would rise. When I'd take the weight out, it would not always return to normal and be stuck in the up (harsh ride) position.

I figured out that the linkage at the torsion bar came loose and was jamming, not allowing the car to lower.

It's an easy check and it's free too! Good Luck.

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1981 300TD "The Green Lantern"
1980 300TD
1983 300D Euro "China Cat"