I have a great resource for you! I found www.alldata.com
which for a low fee provides you with the Technical Service Bulletins for Lexus (and many others). One of the TSBs is how to reduce the "wind throbbing" of the sun roof. Depending upon the mileage on your car this may be covered by warranty. But Lexus will not fix this unless you specifically ask them to.... That's why alldata.com is so fabulous - there are all kinds of things that are covered by warranty if you only knew to ask!!
Hope that helps!!
