HELP!

I am not very good at any of this.  I am a teacher who directs my school shows.  My lightboard was preset with channel 1 being red, 2 blue, 3 green, etc.  However, i noticed that channel number 1 is not highlighted like the rest of the numbers, and when i pull the knob up I no longer get any color at all.  I need my red back  What do i need to do?

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