Mine had a leak also. The seal in the top pump had gone bad and damaged the pump. I also found that 5 of my top cylinders were leaking.
a new pump and a redo of all cylinders and no more leaks. I had the work done at Sunbrite auto works in Tampa by the stadium. Not cheep ,but Mr.Murphree has been in business over 30 years at the same location. He and his people are Mercedes top experts. If you give them a try..I can get you back to the Villages.

Sunbrite auto works
3924 west crest ave.
Tampa ,Florida 33614
813.873.9816