LIGHT MY BRICKS LEGO NASA Apollo Saturn V 21309 Lighting Kit, Manual

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To turn On and OFF the lights, simply detach the middle section (from the bottom where you the cables are visible) to access the Battery Pack.
This completes installation of the lights to the middle section of the Saturn V. Let's move on to the top and final section.
28.) Take the top section and disconnect one of the outside wall sections using the LEGO Removal Tool