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The issue is with the switch circuit that feeds voltage to the spark module. It is likely that grease has gotten into the switch(es) and is causing that circuit to complete without the switches being turned on. Remove the knobs and use a plastic safe electrical contact cleaner to spray into the switches (mains supply off) and allow a few hours for it to dry out and I suspect it will be just fine. If the sparking continues, you may have to replace the switch harness.