Additional manufacturing narrative: other, other text: the returned device was evaluated which included functional testing.During this testing, the device did not make the start up sound at power on and no audio was produced when the alarm limits were breached.The unit did provide visual alarms, an internal inspection of the device was conducted and the unit was confirmed to have an open circuit across the speaker cables.There was no sound coming out of the unit, since the speaker had an open circuit.A service history record review reveals that this unit was in the field for over five (5) years with no previous reported issues related to this reported event.Initial reporter zip code exceeded the maximum allowable characters, zip code is as follows: (b)(6).
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