Has this happened to any one?

I wasn't the person driving the 2002 S55 at the time but when I got it back I noticed the res empty with the suspension dip stick popped out and a nice spray pattern under the hood.

I hooked up the star and ran the series of tests: sensors, valves, pump, dynamic test. Every thing passed with out any new codes or leaks.

I'm not sure where to go from here, what would cause alot of pressure in the suspension fluid res?

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1999 SL500
2003 C32
2002 S55
2004 S430
2003 E320
2004 E500