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had mine for 6 months I think, still has the streak, I dont even notice it anymore, theirfore it never gets cleaned, thus I dont expect it would ever go away...
not sure I trust the dealer to do the TSB, I might let them in a few months, after theyve done it to a few other Zs, I was the first to get the bose fix done, they were in there searching. they did a good job, and all that, just took em a while.