Unit involved and/or switch is not being returned for evaluation.Serial number (b)(4) indicated the unit was manufactured in june, 2006.Which makes the unit 9 years old.The rocker switch involved is underwriters laboratories listed.Ul does an endurance test which requires 6,000 operations at full load with no failures.(b)(4), the maker of the switch, state the life expectancy normally is quite a bit more, 10,000 to 50,000 cycles.We do not know if the switch was damaged by handling, contamination, and/or cleaning solutions during it's 9 years of service.These rocker switches should be operated using a finger or thumb.They should not be operated using pens, pencils, or other hospital instruments.
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