I have a light fixture that has three switches. I have installed a WS4777 and a slave switch at two of the locations. I had assumed that an extra slave switch CS277 could be installed at the third location. However, I am stuck since the slave has three wires (one red, two blues)while the switch I am trying to replace has four wires (two reds, two blacks). What switch should I be using for the third location? Thanks

Arvi