IBM x3200 M3 7327 Service Manual page 236

9. Remove the eight screws (seven in front and one in rear) that secure the
system board to the chassis.
System board
(8 screws)
10. Slide the system board toward the front of the server to disengage the tabs on
the fan sink mounting bracket from the slots on the bottom of the chassis;
then, carefully lift the system board out of the server.
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System x3200 M3 Types 7327 and 7328: Problem Determination and Service Guide