Dial in boards DIP switch settings

When the maintenance guys took the dialin boards off the track during repaving, they must have bumped the switches and now both display left lane dialins. These are about 2 1/2 year old displays connected to a 2900 timing system.
Can you tell me how to set the DIP switches for left and right lanes?
Thanks.
Can you tell me how to set the DIP switches for left and right lanes?
Thanks.