Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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I'd bet PS pump. Check the fluid level and the fittings for leakage. The W108 I had 25 years ago had chronic PS pump problems. The cover seal sometimes leaks, and the metal to rubber fitting on the hoses are also problem areas. That's a 25 year-old memory, but I hope it helps.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck