(b)(4).The sample was returned for evaluation.A visual exam was performed and it was observed that a knob was missing on the unit, and there was corrosion on the control board.No other issues were found.Functional testing was performed and the unit failed the electrical current test.Based on the investigation performed, the reported complaint was confirmed.Although the complaint was confirmed, a root cause for the issue could not be determined.All aquatherm heaters are 100% tested at the manufacturing facility; therefore, it is unlikely that the issue found in the sample occurred during manufacturing.A defect of this type would be detected during the final inspection test.
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