(b)(4).The sample was returned for evaluation.A visual exam was performed and it was observed that the pressure port stem was completely broken off the pressure port valve.The reported complaint was confirmed based upon the sample received.The returned circuit was confirmed to have a broken pressure port stem.The defect was discovered after being in use for some undetermined amount of time.All circuits are 100% inspected for damaged circuit components at the time of manufacturing; therefore, based upon the time of discovery and the damage observed on the returned sample, it was determined that operational context caused or contributed to this event.
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