Reliability and Provability

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I have a system of which 700 are out on the field and one of the components is causing an issue. A new component has been sourced and I want to test it to ensure reliability. So the test I've come up with is to test this new component on 3 systems of the 700 and on each system test 5 of the new components an collect results. What is my provability of capturing a failure and how reliable is this test? in other words is it sufficient for high confidence level.