SOS - URGENT - START BUTTON FAULT

Tech at theater just called me at home. They press the start button and nothing happens unless they press it several times! They can hear it 'click' but again, no CUE move. They're doing a full scale rehearsal this afternoon (Sunday 2nd) so I'm leaving them to work things out best they can and plan to go in 1st thing Monday. I'll take some contact cleaner, aerosol, test for continuity etc but find it hard to believe this is mechanical - there must be thousand of these boards working their butts off around the world by now and I reckon the GO button gets a lot more pounding then we give it. I'm monitoring the board this afternoon in case any one has any ideas. Thanks.    

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