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Swap the breaker. I'm doing a aluminum remediation of 100 apartments and using Siemens AFCI. Each apartment needs 5 AFCI breaker. Out of the 150 I have already installed, there was one failed breaker. There is not tester for checking them, so the only thing to do is swap it.
Come back after you swap the breaker and let me know how it worked out. You can return for follow ups, no charge.