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You seem to have a very good technical understanding of the issue.
Unfortunately I can't assist you right now. I've just sold my e90 and In the market for a replacement e91. If I pick one up in the next few days I'll run the test.
I never got to do an energy diagnosis with ISTA D. I know that with DIS you could look in a 'Sleep Mode Prevented' menu which indicated which module had prevented sleep mode. Does ISTA /D have this function?
By the sounds of it CAS seems a good bet.
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