I have a 2004 Allroad 2.7T and since a couple of weeks I had recognized that I do lose transmission oil. The oil usually drops on the cat converter and with an evil smell it burns away, but when I park I can see the red oil on the ground not good at all. I was laying under the car a couple of time and tried to find the leak area and I was certain it is the output shaft seal and I exchanged the seal filled in new oil and there it was again. There are three more seal which it could be...I put the car back on the lift and finally found the crack in the transmission which is on the driver side exhaust mount point, please see the attached picture. Can anyone please let me know how I could seal this crack without replacing or removing the transmission.

https://goo.gl/photos/xAYo49JPnvHyYzhZ7

Thanks Stephan