I would not call a leaking Pano roof common at all, since it has only been out since 2004 it hasn't had time to become common yet. As mileage racks up on E53's (and sun beats down on seals) it may become more of an issue but from what I've seen in the past, BMW's issue falls more in line with the drain tubes of the sunroof leaking on the passenger side then from the unit itself.

Your dealer could be moving parts for other dealers

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