Lenovo ThinkStation P7 Manual page 25

2. At the bottom of the 3.5" bay cavity, you will see 4 threaded screw holes and
2 alignment dimples, as shown here:
3. This is where the BCB circuit board needs to be installed. On the BCB itself,
you will see 4 screw pilot holes and 2 alignment holes, as shown here:
4. Insert the BCB in the bottom of the 3.5" bay cavity and position it so that the
alignment dimples on the chassis mate with the alignment holes on the
board.
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