I could not find any info about the SLS damper itself. Is it possible to remove these and refurbish them? I know on my BMW I can buy a O-ring/valve kit and replace all the internal leaking seals with new ones.

Is it hard to replace the damper?

I guess the system uses fluid from the servo reservoir?

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99 W210 E220 cdi sedan automatic (248.000 km) 210.006