Date registered: Mar 2011
Vehicle: 2013 SL550, 2011 E550 4-Matic, 2010 S550, 2010 BMW X3
Location: Near Myrtle Beach, SC
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Ditto's on the clogged drain. I've had this happen on SAABs, BMWs and a Toyota. I live in Myrtle Beach South Carolina and t usually hits you after the pine pollen and oak leaves falls here in early spring. But this, dust, leaves, all work together to clog or partially clog the drain holes. A long cable---like a motorcycle brake or throttle cable gentle worked through the drain works well.
HOWEVER! One leak on a BMW we thought was coming from the sun roof actually came from the weather stripping around the doors and windows. Everything looked fine, but it had lost some elasticity and when water hit hit at the right angle would bend over and leak.