Quoted from http://www.pinrepair.com/sys11/index3.htm#flip

Williams has a feature called "lane change" in many of their games. This allows the player to change the lit lanes using the cabinet flipper buttons. Prior to Banzai Run, this is done by doubling up a second switch on the flipper EOS switches. The EOS switches are a +50 volt switch. The lane change switch is a +5 logic switch connected to the switch matrix. These two switches are insulated from each other by a small nylon "triangle" activator. But if these two switches touch, the switch matrix will burn (as described above).

When adjusting or cleaning the flipper EOS switches or lane change switches, make sure the game is turned OFF. This will prevent shorting these two switches together. Also, do not clean the smaller lane change switch with anything other than a business card.