IBM System x3550 M4 Installation And Service Manual page 347

18. Grasp the system board handles and lift up the system board and carefully
remove it from the server, being careful not to damage any surrounding
components.
Figure 239. System board removal
19. Remove the socket covers from the microprocessor sockets on the new system
board and place them on the microprocessor sockets of the old system board
that you are removing.
20. If you are instructed to return the system board, follow all packaging
instructions, and use any packaging materials for shipping that are supplied
to you.
Attention: Make sure to place the socket covers for the microprocessor
sockets on the system board before returning the system board.
Chapter 6. Removing and replacing components
329