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I was unsuccessful at getting a TTL Serial USB UART to show the console during boot. It may be disabled or the PINs may be for JTAG instead. I did get a working GND + VCC (3.3V).

Removal of the bottom required 3 screws (under the rubber feet) and pushing some plastic clips in. I was able to do so without any plastic clips breaking.

Useful FCC document: https://fccid.io/2ABLK-GS4227/Internal-Photos/Internal-photos-5245853.pdf

Some photos of the process:

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