Just a little FYI, the accumulators are the "cheapest" part of this system. At least on my W123 TD. For my car they about $75 a piece. Get under the car and see if the shock is leaking at all.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member