Errrr Porsche won't fix it because it's an Audi 01X transaxle... With slightly different castings, practically interchangeable if you're willing to drill a few holes out etc.
Probably get an 01X donor box and use the guts from that?
I’ve just bought a second hand box about two days ago, but good to know, this is a Audi A4 B7 2.0tdi box is that right? As not sure how long this next box will last me.