My '06 sleeps at 11 mA. I also chased an amp draw for 6 months. Did you pull the rear fuses? What about the main fuses under the spare tire?
My amp draw was chased to the GMIII module. I should have guessed. Rear lights acted weird. It wouldn't go to sleep. Rear locks didn't work.
Another amp draw was the EWS module. Test the alternator.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)