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Gearbox leak
Had exactly the same problem on my auto gearbox on my 07 plate 335i noticed a leak that looked like the sump gasket,turned out to be the mechatronics sleeve...
Although the sump gasket is a known fault on the auto gearbox's as there made of plastic they get very hot and warp leaving you with a leak,if it where me I would replace the sump also mechatronics sleeve aswell as oil and you should be good to go!
I got all my parts from here http://www.incarmotorfactors.co.uk/en/1115607-bmw-3-series-e90-zf-transmission-oil-service-kit-bmw-6-speed-automatic-6hp19-21osk0.html# I'm sure that is all the parts you need..and it's all genuine parts!
Good luck!
Matt
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