The screw hole near the left and button side seems to be easier to pop out first. Use thumbnail to pry under the marked location while simultaneously pushing on G7 to pop it out.
Repeat on the other side, pressing on G8.
The assembly should come loose. Push on the buttons and gently wiggle and pull it out.
There will still be a bit of friction between the PCB and the center post on the top shell but it won't take too much force. Try to gently persuade it out.
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