IBM Power Systems 9009-41A Manual page 87

Figure 72. Fastening the fan socket to the bulkhead
4. Remove the socket dust covers from the system processor module sockets on the new system
backplane:
a) Grasp the latches on both sides of the socket dust cover and squeeze them inwards until the
latches release from the pins on the system backplane. See the following image.
b) Lift the socket dust cover straight up as shown in the following image. Set the dust cover aside.
Removing and replacing the system backplane in the 9009-41A, 9009-42A, or 9223-42H 73