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It was from here. Quite a way down the page
https://www.bicycling.com/bikes-gear/a26150279/sram-red-etap-axs-review/
It was from here. Quite a way down the page
https://www.bicycling.com/bikes-gear/a26150279/sram-red-etap-axs-review/
Just going by what I read which is that the power meter is a one piece with the rings and so to replace it, you need to buy a new power meter entire unit at $826