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Only a fool would trust electronics to protect their body parts. The saw safety devices will be like airbags and other electronics that periodically have masses of faulty parts sneak into the supply chain.

Before you take it apart, try spraying a good shot of Contact Cleaner into any small openings in the switch and work the switch back & forth a dozen times. I have rescued dozens of "Broken" switches using this technique. Internal corrosion can keep current from flowing, particularly if you live...