[njsteve]

Yeah, I was looking online for C6 common leaks. I think the sitting for 4 years and the resultant draining of the fluid into the main area of the case is what caused the leakage, as you said. There were initially some drip marks around the selector shaft as well as the entire pan gasket. I ended up tightening the pan bolts and brake-cleaning the entire area. Haven't had any more drips since then.

Here's a couple shots after brake cleaning the entire area. BTW, is that black plastic spacer on the selector shaft supposed to have that slot in it? Or is it a crack?