I think wahoo can repair everything but the version 1 kickr. This doesn't look like a V1. Okay, it's not, I can see the handle in one of the pictures.
And get rid of that other power supply
The power regulator is U3, it's an MC33275- something (3.3v)
MC33275DT−3.3RKG
Didn't see an absolute max input voltage, they just say input voltage is 13vdc
https://www.onsemi.com/pdf/datasheet/mc33275-d.pdf
I always wondered if it would help to replace that chip antenna with an external antenna. Doesn't look particularly easy
The module manual says how to upload firmware via a couple of pins. Getting it from wahoo would be a bit of a hassle, but they let you download it.
https://fccid.io/PADWF116/User-Manua...Manual-3085164