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3. Remove the two hex standoffs from both sides of the RS-232 connector.
4. Unfasten 34 bottom screws (as indicated by the arrows below). Note that two
of the screws are shorter ones (as indicated by the dotted circles).
5. Slightly lift up the bottom cover from one side by inserting your fingers at the
two dented corners (as indicated by the fingers below). Be careful not to pull
the fan cable underneath the cover.
= Shorter screw