I doubt anyone got this resolved ...I had to go through Cadillac to get the TSB work done since the dealer could not replicate it. It's interesting yours started at 20k miles...almost everyone had this issue from the beginning. If this is happening consistently and can be replicated then take it...
What is your in service date for the 4 year B2B? I am thinking of doing the same but my main concern was the engine, the 6 year/70k power train should cover that though.
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