Audi A8 2.5TDI gearbox problem, defect??

Hello, I'd like to introduce myself as I'm new here, so I'm Marc and 23j. old and apprentice to the motorist mechatronics engineer in the 3rd year of a FREE workshop and driving one or more a 200 A8 with 2.5 TDI engine with 180hp, MKB:AKE and GKB:FEE.

To my problem, I drove quite normally about 20km and everything was order, then it started to turn on Heftig Hart (automatic gearbox) ok, from back home, just got there still so, I stand quasi in front of the house and wanted to drive the yard drive up and didn't even come up half way, OK, then tried to come into the parking bay with less than pace, then stood there and it suddenly squirted and extremely smelled of transmission oil, so the engine only turns up and comes no more forward, then with the trailer to my workshop towed, looked, ah Okay, ca. 2liter filled up, in the front with pit lifters, and let go, nothing comes. ==References== 15min, it started to run at once, when it was warm then I guess, before, after I had filled up sparkled in the high-bocked condition at least everything, it was possible to switch all walks asteriskly and also by hand, since tiptronics, so at the lever, until it just started to run out again, well my question, is something like this perhaps known with this transmission? what's broken?For the box I saved for a long time and it got all my money and now that, an outdated gearbox with converter costs around 2000€ and for that I would have to save for long, so try it now, maybe someone is more aware of it or experience, gruss Marc