Investigation completed on 05/may2017: unit was per functional inspection procedures and no duplicate condition was found as reported by the customer.Some movement in the swivel was noted but it is unrelated to the reported complaint failure.Device history record reviewed for product id 40a3059 work order (b)(4) serial # (b)(4) a total of (b)(4) were manufactured on 10-20-16 show no abnormalities related to the reported failure.The devices manufactured during this period passed all required inspection points with no associated mrr¿s, variances or rework.No service history is on file for this device.A two year lookback in the complaint system for this reported failure and or related to " does not lock correctly or issue with lock" for product id a3059 shows that 7 complaints were received including this case.No new design or manufacturing trends have been identified.This issue will be monitored.Root cause was unable to be determined based on unit passing all required tests for final inspection.
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