I've had connections shake loose, so if the troubleshooting indicates a possible connection problem, I would definitely pull the radio unit (as described above) and check/re-seat all the connections.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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