IBM iSeries 270 Service Manual page 69

3) Starting with the brush in the center of the processor contact surface that is on the system
backplane, use an outward brushing motion to clear the debris away from the area where the
surfaces of the processor module assembly and the system backplane assembly meet. Be
careful not to brush over the contact surface again. Then, continue brushing around and
away from the perimeter of the contact surface area (out approximately 6mm or more on all 4
sides of it). Do not brush the processor module or the contact surface on the bottom of
the processor module.
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Analyze hardware problems