Unscrew outer screws located next to the male USB-C connection. On only the Ethernet expansion card there is another set on the bottom by the Ethernet end.

Slide the cover towards the male USB-C connector

It may take some force

The Ethernet expansion card moves much less than the other cards

Then lift the cover off

Ethernet is also held on by clips

Unscrew the 2 screws holding in the PCB (the circuit board)