I jacked up the back of the car and manually lifted the actuator up and down to insure it wasn't hung up or bent, it was not. I visually inspected all the lines and the box, very clean, no leaks and no signs of previous leaking.

I set the car down and started it and low and behold the SLS kicks in and raises the car up but almost immediately the driver side sags back down. I manually activate it and same story, goes up and then loses pressure. I looked for leaks none found.

I am guessing I may have a bad shock? Won't hold pressure? Any help?

If you look at the car now, passenger side looks normal, driver side way low in the rear.

I also posted earlier that I had a leak, but it was on the passenger side and I believe it must have been from some other source.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6