weeping differencial

[DavidWeis]

HI,
I just had my 98 SL500 checked out at MB Dealer. They said I had a weeping differential, and that it should be 'watched'. I took a look at it, the main body is 'weeping' while the area near the crankshaft has an actuall drip.
What should I do..Is there a quick fix? This diff looks like its tough to get out.
And sorry for my ignorance, is this the tranny fluid thats leaking? , and should I check its level?

Thanks for your help.

Dave