So, I just found this thread...Im running in the same issue, sunroof drain tubes clogged, bunch of electronics toasted, looking at a total of 5 plus k repairs at the BMW dealership.

BMW of NA just denied my warranty claim because those are items running under maintenance and were caused by "external factors". The Service Advisor told me because the car was "parked under a tree" and the drainage got filled from debris from the tree.

I never seen in the BMW cars manual do not park under a tree nor a schedule maintenance for the drain tubes.

The car is a 2011 35d. The car was serviced all the time at the dealer. It also had the maintenance plan from BMW. - expired at this time.

I'm debating what to do next...