Transmission oil pan leaking?

[318touring]

Doing my usual Saturday morning check-under-the-car routine, and noticed that something might have been seeping/leaking very slowly.  I was investigating what could be making the noise referred to in this http://www.renntech.org/forums/topic/44468-auto-noise-when-stationary-and-in-gear/

 

Nothing on the ground.

Did the most sensible thing, and pulled the cover off, and cleaned it up (pic below)



Checking around, it seemed that the area around the transmission oil pan is a bit grimy, like being caused by slowly escaping oil.



Interestingly, one of the bolt's head was filled with oil.



Definitely not engine oil, so would it be that the pan's gasket is leaking, or the pan hasn't been tightened correctly causing it to seep oil?

Or is it something else?

Car is 2003 C4 Cabriolet Tip

[Ahsai]

Maybe after cleanup, just leave the cover off and drive it for a few days and recheck to see exactly where the oil is sipping from?

Sounds like gasket. Can also use a torque wrench to check the bolts.

[318touring]

Thanks Ahsai.

 

Gasket was my the top of my list, they might not tightened the pan correctly as suggested by Porsche when they took the tranmission out. 

 

BTW, would you have any idea what would be causing this sound, as captured in my last post in this thread http://www.renntech.org/forums/topic/44468-auto-noise-when-stationary-and-in-gear/?p=261472?