what 2 of 3 wires to jump cash door switch?

[overload]

have error 54 and 24 , 3 wires on upper cash door switch what 2 do i jump? also, have 24 , reverse coin, i would think this would reset with mcu reset, i understand when you drop coin you may get it, but how does the mcu know you havent replaced all parts if you havent dropped a coin? do i do ram clear? every time i reset or reboot it comes up with 54 and 24