Just sent you PM. If anything the gear in the transfer case needs to be flipped, or replaced. SlickGT1 flipped his and I believe got at least 2 more years of service out of it.
The Bosch 8.0 shouldn't need a rebuild, but it wouldn't hurt. If it were me, I'd swap the gear in the transfer case around (free), see if that makes the trifecta go away. If it remains, then look into the ABS module repair.
If the gear is worn, you should be hearing an audible click 1-2 seconds after shutting the X5 down.
http://johnnyvest.hubpages.com/hub/B...roblem-And-Fix
Slicks reference to flipping the gear below:
http://www.xoutpost.com/bmw-sav-foru...or-gear-2.html