The used warming device was returned without it's main cable or hose.Visual inspection observed smoke residue on the warming device where the main cord plugs into the device.During functional testing, a new power cord and hose were attached to the warming device.The device performed self-test with no issues observed.The device was set to each of its three temperature setting; all temperatures found within specification.Electrical testing found no electrical surges or performance issues.The main socket, hose, and main cord were replaced.Inspection and testing of the device could not determine a root cause for the smoke residue found at the main cord socket.
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