600sl hydro/ADS suspension

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The 1995 sl600 in question hasn't had a road trip in over a year. It has been stored in a climate controlled setting and ran/moved about 10 miles in the last year.

The front is now down to where the airdam is about three inches off the ground. Rear is still up so it looks like a funny car or a near sighted ant eater.

I haven't done anything but ran it checked for leaks and confirmed that the screen is clean. The fluid is fresh and reservor is still where it's been since fluid change three years ago.

Can someone step me though a trouble shooting plan and a way to bleed the system? Thank you for your help in this matter.