Hey! I live in Sweden, but I hope it´s ok to write in your forum? 
I´m going to swap my D1S xenon bulbs with new OSRAM Cool Blue on my X1 28i -10. I have been looking online for instructional videos, with no results.
Has anyone tried it, and knows if it's easy, or if you need to remove the inner screens etc? 
D1S Lampe ersetzen on X1
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Hello and a warm welcome in our X1 forum!
It´s no problem to write in english
But... I´ve never heared about a change of xenon bulbs....
Best wishes from
The uncle