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Thank you for the response. I’ll check in with a professional

Hi, I’m replacing my old 2 gang switch with a smart switch. Having taken a look at the existing wiring I’m a little confused. The existing switch has COM L1 L2 while the new has L1, L2 and L3 I believe I understand COM is L1 and L1 is L2. So no problem there. However I have a yellow wire...