Dealer inspected for issues with wiring and found none. They think the VPM was corrupted and replaced it. Cameras work now.
BTW- our issue was a complete camera failure, not intermittent.
2022 Yukon XL with ~15k mi, same issue - cameras crapped out a couple of days ago. I have an appointment with the dealer tomorrow. Mentioned the TSB, they were aware of it but surprised my 360 cameras were also not working.
I will update on the resolution.
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