I also watched my car coding via ISTA/P. 676 was added to my VO also.
Keep us posted as to what the Dealer says -- I'm still waiting to hear back from mine.
I've looked at what gets changed during coding-- quiet a few of the gong, Bluetooth and PDC volume levels get changed from e90_stereo to e90_hifi after coding. My thought is that its the root cause of the volume issues.
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