Siemens has completed the investigation.The instrument was returned with the appropriate power supply but without the batteries that were said to be in use at the time of the event.The d16 on the main board was the source of the light smoke produced, but it is not a fire risk due to plastics being 94v0.D16 fails when an incorrect power is connected to the device, either through plugging in the wrong power supply (device uses a common barrel connector) or using 3.5v rechargeable batteries (device specifies using common 1.5v aa batteries).In addition, this can be caused by any natural event causing a power surge.
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