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4Remove the 2 screws securing the subwoofer to the base panel.
5Lift to remove the subwoofer from the base panel.
6Replace the new subwoofer on the base panel.
7Secure the new subwoofer with the 2 screws that was remove on step 4.
8Replace the system board by following steps 23 to 44 in “Replacing the system board” on page 107.
9Replace the bay cover, then tighten the cover screws.
10Reinstall the battery.
