LEGO 76139 - Step 28: Connect Cabin Lights to 6-Port Board; Connect Bit Lights to 6-Port Expansion Board

28.) Connect both Bit Light cables we just installed to the 6-Port ExpansionBoard from step 26,
then take the AA Battery Pack and place it inside the back of the Batmobile ensuring the
switch is facing up and closest to the back. Connect the Battery Pack cable to the 8-Port
Expansion Board (Do NOT connect the battery pack to the 6-port Expansion Board.)