Power off the server and disconnect the power cords from the power supplies.
See Powering Down the Server.
Extend the server to the maintenance position.
See Extend the Server to the Maintenance Position.
Attach an antistatic wrist strap.
See Electrostatic Discharge Safety.
Remove the server top cover.
See Remove the Server Top Cover.
Swivel the air baffle into the upright position to allow access to PCIe cards.