Thank you MB Doc, That was what I was aiming to. I remove the metal cover protecting the connector and saw some of the fluid at the bottom of the casting. Also the electrical wires and connectors attached to the oil pan were wet with oil. After cleaning and drying everything, I placed one of this absorbent mats in the lower engine cover and will inspect it next week to see if I can find where the first drop is coming from. This car only have 30,000 miles.
Can I ask you also if flushing (I should say replacing the brake fluid) the brake system with new brake fluid is as simple as pressurizing the reservoir and opening the bleeder screw in each caliper? This was the way I did it in my 1991-350 SD, W126 chasis.

Thank you again for your time and advice.

Darrel.