Complete these tasks:
"2.1 How to Power Off the System"
"2.4 How to Position the System for Service"
"2.6 How to Remove the System Cover"
"2.8 How to Avoid Electrostatic Discharge"
Remove the Phillips screw attaching the air guide to the CPU card cage.
Lift the air guide up from the CPU card cage.
To replace the air guide, complete this task:
"3.10 How to Replace the Air Guide"