No lot number was available to report and no samples were available for additional testing during investigation.Photos were provided to illustrate the failure mode experienced at the point of use.Due to the lack of reportable information, the scope of the investigation will be limited to a 1 year batch record and complaint history review.Batch record reviews show that all lots manufactured during 2018 have met release criteria, with all testing results conforming and no anomalies of note.Color transitioning is dark in appearance and markedly different from unprocessed dots.Review of logged complaint history shows several complaints that were reported for an identical failure mode.No complaints on file have confirmed a lack of color transition.This issue has been logged and will be monitored for recurrence.Should additional information become available in relation to providing a sample or a lot number re-analysis will be made.Note: a retrospective review of potential serious injury complaints was performed.This mdr was identified as a reportable malfunction as a result and filed as part of the review activities.The complained product was not returned and the batch # was not provided.Due to the time frame, it was reasonable to assume that the product fell within the scope.
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