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The plastic door of the expansion pops right off to reveal several screws and another port of an additional expansion if you so wished.
These screws are a bit of a wild goose hunt. They only apply to the expansion card and they are double set screws. By that I mean, the first part of the holds the expansion card to the case and the second part holds the expansion card together. But we'll get to that later.
The top of the main case is held in place by tabs. These tabs (red arrows) are released with a gentle twist of a flat-head screwdriver.