IBM i 830 Repair Manual page 675

Remove and Replace Procedures
i. This step will instruct you on how to use the special brush that was
provided with the new processor. It is important that you follow these
instructions very carefully:
1) Remove the special brush from the packaging.
2) Refer to the figure below:
Figure 18. Model 830 System Unit Backplane (MB1)
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Chapter 4. Removal and Installation Procedures