So, as it turns out, the leaking fluid is from the left side, convertible top ram. That's (I suppose) good news that it's not the trans or brakes. The bad news is that the part alone was quoted at ~$350 plus at least 2 hours labor!

Can't seem to find the part listed on any of the MB parts companies online. My [independent] service center says the part is only at MB directly.

Whadda ya think?