Talking in general terms rather than specific to R class which I am not familiar with.
The pressure in the bag will be controlled by an electronic control unit and adjust pressure in response to inputs, principally the height sensor.
I would expect to see a height sensor on each side of the rear suspension, do a visual check first to make sure linkage is intact, not bent or been forced over center.
After that you will need it on a scan tool to check out live data & faults.
Cheers Aidan
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