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I have the same problem on my 2019 Blzr RS.I had a similar issue back in December on my 2021 RS. I was getting "service ESC", "service parking brake", "service power steering". It took the Tech about 4 hours to track it down. Turns out the problem was that the Connector X2 of the active safety control module was not seated fully and locked into place.
Thanks for your note.