(b)(4).A device history record (dhr) review was performed and there were no issues found that could relate to the reported complaint.The product was assembled and inspected according to specifications.The sample was received for analysis.A visual exam was performed and it was observed that the circuit was melted.The corrugated tubing was inspected and it was found that the heated wires were assembled incorrectly.They were not uniformly distributed along the corrugated tubing.The heated wires were disassembled in order to inspect the wires for resistance and length, and were found to be acceptable according to acceptance criteria.The heated wires were functionally tested and no issues were found.Based on the investigation performed, the reported complaint was confirmed.The heated wires were assembled incorrectly, which is what could have caused the melting of the corrugated tubing.As a corrective action, the personnel involved in the manufacturing process were notified about this issue and will be retrained on the work instruction to verify the heated wires are distributed uniformly.
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