Does anyone know the process for diagnosing the self leveling system to my MB wagon. Took a load of cobblestones the other day and I think I may have done it it. Some weird noises came from the R side rear. Checked the fluid today and noticed it to be very low. Will add more tomorrow. It rides very low right now, and the leveling system does not rise with a load any longer..

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85 300TDT 456,000 orig. miles