Flip the mouse over to gain access to the bottom.

Using a scalpel, pick, or similar tool, peel away the slide pads on the bottom of the mouse in order to expose the three screws.

Using a PH0 / Phillips #0 driver, remove the 3 screws shown in red.

Gently separate the two halves of the case. Light prying may be required.

For PCB removal : remove 3 PH0 screws from PCB surface. The whole PCB can be taken out for inspection and repair after the screws are removed.