Lenovo THINKSERVER 392 - Manual (Page 176)

12. Remove the eight screws that secure the system board following the recommended numerical sequence
as shown. Then, carefully remove the system board out of the chassis.
Figure 99. Removing the screws that secure the system board
13. Place both the old system board and the new system board on a clean, flat, and ESD-safe surface.
164 ThinkServer Hardware Maintenance Manual