I agree with Arnold.
Check that the cove bolts are tight.
I actually had to retighten mine yesterday, had some seepage, nothing like you mentioned.
But could be really loose or need a new gasket.
The gasket for the right side, its not hard, but you do have to take off the rear brake lever, to get to the case to replace the gasket.
Its in the way of taking the cover off. now Im not sure about 2003 and newer models, with the hydro rear brake.
Sporty