The receiver was evaluated.An external visual inspection was performed and passed.Charge and boot testing was performed and passed.The receiver log was downloaded and reviewed, finding no errors related to the complaint.Functional testing was performed and passed all relevant testing.Audio\vibration test with global receiver communication tool test was performed and passed.Manual try-it audio\vibration testing was performed and passed.The receiver was opened and an internal visual inspection was performed and passed.Speaker audio and vibrator intermittent tests were performed and passed.Speaker and vibrator resistance were measured and were within specification.The reported event of an intermittent audio output was not confirmed.A probable cause could not be determined.No injury or medical intervention was reported.
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