Well that didn't last for long...It's now officially dead.
Good thing is I now know how to replace the whole module (controller). A few easy steps to get access to the module and swap.
The real challenge will be to find an affordable controller. I don't want to end up spending the 200$-plus I saw so far on e-bay. I'll call the dealer tomorrow but I doubt it'll be cheaper than that.....

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His : 2005 X5 4.8is (SOLD)
Hers: 2007 X5 3.0si (SOLD)
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Retired:
1999 518
2000 323i
2002 M3 (beautiful car)
2003 330Ci