Sony PCV-RXG408 User Manual page 79

Upgrading your VAIO computer
5 Position the main unit so the back panel is facing you.
6 Locate the tab on the upper right side of the rear panel, and pull it back until the side cover releases.
7 Lift the side cover away from the unit and set it aside.
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Always wait for the internal parts of the system unit to cool down before removing the side panel.
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