IBM 84885BU Maintenance And Troubleshooting Manual page 101

12. Move the latch that secures the system board to the chassis.
Press here
13. Lift the front of the system board to clear the locating pin; then, slide the board
forward to clear the EMC shield.
14. Lift the system board out of the server chassis.
To replace the system board, reverse the steps.
91
Chapter 5. Field replaceable units