A replacement transformer was sent to the customer.The product involved in the complaint was returned on (b)(6) 2014 and evaluated on (b)(6) 2014.The customer's complaint sparking was not confirmed, however the product evaluation showed that the transformer housing was breached.The cause of the breach in the rev n transformer has not been determined at this time.It is currently being investigated under (b)(4).A visual examination of the power supply revealed the transformer housing was breached, exposing inner electrical circuitry.A visual examination of the cord revealed no exposed wires.The power supply was plugged in and the voltage output across the dc plug was measured as 0 vdc.Resistance across the dc plug measured 0.74m ohms, which indicates that there is not a short in the dc cord.The resistance across the ac blades measured open, and indicates that thermal fuse did blow.Smoke, fire and sparking was not observed while plugged in.
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