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Most issues under warranty like this they have to contact a gm support line so GM really controls what parts are replaced. All that means is they are in communication with their tech line cause they are having issues. It's possible it's been escalated beyond the normal techs they talk to.
It took them 3 weeks to replace a radio module in my tourx cause they had to deal with gm and the weren't exactly quick in dealing with the tech at the dealer.