Lift the yellow lock to unlock the release lever > Lift the release lever and use it to pull out the failed power supply unit > Replace the failed power supply unit with a new one

Lift the red lock to unlock the release lever > Lift the release lever and use it to pull out the failed power supply unit > Replace the failed power supply unit with a new one > Ensure the gold connector pins are on the top > Push the new power supply unit into the tray > Push the release lever down and in until it clicks > Ensure the red lock on the release lever is locked

Lift the blue lock to unlock the release lever > Push the release lever down and in until it clicks > Ensure the red lock on the release lever is locked

Lift the release lever and use it to pull out the failed power supply unit > Replace the failed power supply unit with a new one > Push the new power supply unit into the tray > Push the release lever down and in until it clicks