300E Tranny Leaking

[hs_300e]

I recently replaced the transmission oil on my '86 300E (69.5k mi) and it is leaking oil. Here are the symptoms:

I don't think it's leaking when I am driving. If I check under the car after parking it for a copule of hours after driving, there is no leak. But if parked for 5 to 6 hours or overnight, then I can see fresh oil on the floor under the transmission oil pan.

I have tightened the pan bolts to spec and I don't think it's leaking from around the gasket area.

Are there any other places where it can leak from?

TIA.

hs