IBM 84875MU User Manual page 85

8. Gently slide the system board toward the front of the server to disengage the
retention tab on the bottom of the system board from the notch on the chassis;
then, lift it up and out of the server.
9. If you are installing a new system board, remove the heat sink retention module
and the retention tab on the bottom of the system board and install them on the
new system board.
To reinstall the board, place it into position in the server and slide it toward the rear
of the server until the holes on the system board are aligned with the holes in the
chassis; then, replace the components that were removed in step 6 on page 74.
Important: When installing the system board, make sure that the clips at the I/O
section of the system board slide into position on the chassis.
When reassembling the components in the server, be sure to route all cables
carefully so that they are not exposed to excessive pressure.
Chapter 6. Field replaceable units
75