i have an 06 too and had a minor leak once..yellowish trans fluid. it only happened 1 time after the car was parked for a few days without moving.
last summer when i did my trans fluid/pan, i also had the mechatronic sleeve done at the same time. The leaking sleeve is common in the 06..
the mechatronic sleeve wasnt expensive, i seem to remember maybe 25$. It was changing the pan and trans fluid that was a good 250+