Have they bothered to pull the a-pillar covers off yet to see if the drain tubes are kinked? Very common problem for the late '04 and early '05 but seems to be a problem for all of them, per my dealer's shop foreman.

When my overhead console dripped, they pulled the pillar cover and the drain hose was kinked shut! The had to pull the sunroof cassette out to replace the tube. But then the brain surgeon who did the sork put the pillar cover back on so that one of the tabs crimped the tube shut again. Cassette out again and another hose installed. No leaks since.

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'04 E53, 4.4 Sport
'97 E39 528i
'86 911 Carrera, track car
'96 BMW R1100R