Oil Leak on my 325i Coupe

Hi guys

Im not a fundee when it comes to engines.
My problem may be common or not but here goes,

I have a oil leak on my E92 2007 325i coupe Auto, yesterday i popped the hood to check something, whilst the car was idling i noticed oil leaking from the plastic cover right hand side on the top half.

My car is under an aftermarket warranty, what could it possibly be?
Im planning on taking off the top cover to investigate the origin of the leak. if possible i will take out a few snaps.

Please help