IBM CS821 Service Manual page 58

Figure 46. Removing the processor air baffle
4. Label and remove the memory DIMMs, recording their slot locations. For instructions, see
"Removing and replacing memory in the 8001-12C or 8005-12N" on page 29.
5. Remove all the fans and housings from the system. For instructions, see "Removing a system fan
from the 8001-12C or 8005-12N" on page 17.
6. Noting their slot locations, label, and remove the PCIe risers and adapters. For instructions, see
"Removing a PCIe adapter from the 8001-12C or 8005-12N system" on page 32. Remove the large
PCIe riser first.
7. Remove the 12 screws that support the processor sockets from below the chassis.
a. Turn the system over, upside down.
b. Remove the 12 screws from the bottom. The screw locations are shown in Figure 47 on page 43.
c. Turn the system over, right side up.
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Power Systems: Servicing the IBM Power System S821LC (8001-12C) or the IBM CS821 (8005-12N)