You have the exact same problem that several of our customers have had.. Your Porsche Dealer is like the one mentioned in the testimonial on the front page of my site, at the bottom
www.flat6innovations.com ... We saved his engine and his money when the same exact issue struck..
We **may** be able to save yours, but Porsche can't and won't try to.. Most don't know that the technology exists because their information supply source is limited to themselves.
These pics describe your scenario... Explore the possibilities outside Porsche before going further. if you just have oil loss, minor noise and etc the bearing may possibly be worth extracting and replacing. This is done with the engine in the car as depicted here.
http://www.flat6innovations.com/saving-an-engine-ims-retrofit