The USB-C charging port has a persistent reliability issue despite testing with multiple working power adapters and cables, and after attempting physical cleaning and inspection.
Power off the device.
Warm the adhesive with a heat gun for 30 seconds.
Be careful when handling the special-purpose screw highlighted in red.
Remove the six highlighted screws using a Phillips #000 Screwdriver or a bit.
Detaching the flat cable from the case frees up the USB-C port.
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