Remove the Controller Top Cover
Servicing most of the controller components
requires that the top cover be removed.
If the top cover is removed without first removing the AC power cords, the
controller host shuts down immediately and an event is logged to indicate
that the chassis top cover has been removed.
Ensure that the AC power cords are disconnected from the controller power
Open the controller fan door.
See Open the Controller Fan Door.
To open the controller top cover, press and hold down the top cover
release button and use the recessed area to slide the top cover toward the
rear of the controller about 0.5 inches (12.7 mm) .
Lift the cover off the chassis and set it aside .