S-Tronic gearbox oil leak at the back

[supr3me]

Hi, I'm new here 

I just did full service to my car (60k miles) and I've noticed a leak at the back of a gearbox. Maybe someone can help me to find out what happened. Gearbox oil changed at 40k miles at Audi Hull UK.

Do I have to take out whole gearbox or just the back part?
What could be the cost to fix it?
Do I have to change gearbox oil again?

Thanks

[Steve Q]

As it's leaking oil I wonder if it's a gasket? 

Abd the oil may need changing as you'll loose some once you start separating the affected part. 

Cheers

Steve