No DIY articles, but those who have chased problems with sunroof drains have had the headliner out.

See this thread, and also read the two threads that Weasel links in this thread.

http://www.xoutpost.com/bmw-sav-foru...headliner.html

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue