I notice a slight leak at rear of the left Camshaft. Apears to be a rubber plug in that location. Does that plug just pop out and is there a "O" ring seal on it or what? What is the recomended fix for that leak? I hate to just pull it out without having the proper parts to fix it.. 2007 S550.

There are two plugs on the back of the head, i need the VIN to determine the right PN.

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Vin is WDDNG71X57A073576.
Does the cap need to be replaced or is there a "O" ring in there or is it all in the cap?

Common problem on your M273 engine, (M272 as well). Quick and cheap fix though. Pop out the old end caps and pop the new ones in. Lube the seal first.

Thank you.. I will get the plugs and fix it..