2007 BMW 530 Need offical wording of "High Battery Dra

Hello,

I have a 2007 530XI BMW. Every so often my car will display the error message of, "HIGH BATTERY DRAIN" and display a picture of a car on a lift in the center dash. One of my BMW service reports stated that that this is caused by a pull of over 70ma while the car is asleep but that the BMW service center was not able to reproduce it (happens every few months). Future service reports change it to I do not drive enough, even though my average miles per trip is 17 (as reported by the car's computer). I suspect that something like the comfort access is staying on, or coming on. In any event, a dispute has arisen as to what this error means. Could someone please provide official wording as to what this error means, and cite the reference. For instance, a BMW user manual, BMW troubleshooting document, BMW tech bulletin with identifying number, etc. I need something from BMW themselves and not just a statement from a mechanic. A picture of the document or the document itself would be very helpful. Thank you for all your help.

Sam