Faders stopped working

I have a light desk Colorsource 40. Suddenly all the physical faders stopped working. I can still select a button and use the fader on the screen but the physical ones don’t work anymore. The problem is in channel mode and in playback mode. 
Is there something i can try before sending it back for repair? It’s very urgent. We are a new theater and we open in 3 weeks. 
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