[uwanna]

Originally Posted by Lapkritis

Clean up the sludge on the case there. At about 7 o'clock in the space behind the cooler is a thin portion of the case that is known to leak. The repair is cleaning thoroughly and applying epoxy. It's a slight indent... you'll see it.

Lapkritis is correct, there is a known weak/thin spot in the casting on some cases. There is a Tech Bullitin from Porsche on this problem. Here is a link to a person who was having your exact problem, has the pertinent info for you(also has some links to other threads). I would hate to see you reinstall with
new seals and still have the problem. Good luck!

http://forums.pelicanparts.com/porsche-911-technical-forum/694440-oil-leak-oil-cooler-leaks-right-lower-side-away-gasket.html