Remove the following four screws securing the power supply to the outer case:

Two 22.2 mm fine-thread T10 Torx

One 25 mm coarse-thread T10 Torx

One 9 mm coarse-thread T10 Torx

The next few steps bring your hands close to the exposed face of the power supply. To avoid a high voltage shock from the many large capacitors attached to the board, do not touch the face of the power supply.