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For what it's worth since it seems you pretty much got the info you need but, the problem you're experiencing is a know issue. I had the same problem with very similar error codes you had. BMW covered the repair under warranty which was a burnt up ground cable on one side causing a short. They claim the other side was going to short soon as well so they replaced both tail light wiring harnesses with a retrofit kit. No problems since. There's a forum thread around here somewhere where a bunch of us had the same problem.
I have a pretty serious upgraded sound system installed in my car with about 10 feet of 1/0 gauge wire running up to my amps and they still covered it so that was fortunate.
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