IBM Power System 8247-42L Manual page 96

Figure 77. Location of system backplane screws
3. Place the original system backplane on the packaging for the replacement system backplane FRU
and place it near the system with the replacement system backplane.
4. If your system is an 8286-41A, replace the rear air baffle and rear air baffle guide on the replacement
backplane. If your system is not an 8286-41A, skip this step.
a. Remove the three screws that secure the top cover attach bracket by using a T-10 Torx driver.
Then, remove the top cover attach bracket, as shown in Figure 78 on page 79.
78
System backplane