The customer returned 52 units for analysis.Leak testing was performed on each of the returned units and no leakage was observed.We were unable to determine a root cause for this occurrence based on the provided samples.Bd was not able to duplicate or confirm the customer¿s indicated failure mode.Quality records have been consulted for tracking and trending purposes and no issues like this are detected.Dhr performed showed material (b)(4) with lot number 7152548 was manufactured on jun 29, 2017 by equipment (b)(4).No qn¿s or other extraordinary events that can explain the incident have been related.Process fmea rm5943 was reviewed and there are proper controls in place to detect product malfunctions.Based on investigation results to date, root cause for manufacturing process cannot be determined.Based on an evaluation of severity and frequency it was determined that no corrective action is required at this time.We will keep monitoring the manufacturing process and in case any emerging trend is detected, further actions will be taken if necessary.
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