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It's a common issue that the light goes out on these switches, I seriously doubt it's a wiring issue. I tried to repair the light in mine, but I mistakenly assumed the fault was in the piece that connects the PCB to the switch. I soldered the PCB in, only to find out that the fault is in a component, possibly a diode or a resistor, which probably has a bad solder joint but I couldn't get to it. I replaced the switch instead..