Here is the pic of the first leak spotted .
I called my volvo mechanic today, he is back to work! He told me it must be from a bad cork (yes, cork!) gasket which is located beneath the metal framework . I cant find the reference of that gasket on the web...if you have any idea, let me know.
Edit : I found the cork gasket.
Now about the above photo: I think it could be the pan gasket?!