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Actually the pump and reservoir are in the trunk under the plastic cover under the spare tire. It just takes a 10mm socket to remove that black plastic cover to get at theis unit.
Hydraulic cylinder is leaking. Average mechanical ability needed to replace this part. There are 2 of them on top of your windshield behind the plastic cover. Once you remove it (or both) you can have them rebuilt via mail for about $ 100 each. MB will charge several hundred for replacement.