thanks X5 Miester,
I will continue to monitor for a leak and if I see it again (which I will probably do given the amount of rain we are expecting), I will talk to the dealer and mention the SIB as well.

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Currently driving: 2011 E70 x35i , 2011 E90 335d
Previous BMWs: 2007 E90 328i , 2005 E53 3.0i, 2011 F10 535i (6spd manual)