Investigation summary: no product or photo was returned by the customer.The customer complaint that there is a back check valve failure could not be verified due to the product not being returned for failure investigation.A device history record review for model 11532269 lot number 21046047 was performed.The search showed that a total of 15363 units in 1 lot number was built on (b)(6) 2021 there were no quality notifications issued for the failure mode reported by the customer during the production build of this set.Due to no sample being received, an investigation could not be performed and a root cause could not be determined.This incident has been added to our database of reported incidents.Our business team regularly reviews the collected data for identification of emerging trends.Investigation conclusion: no product will be returned per customer.No investigation was performed.
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