Upon receiving a visual inspection revealed no external damage.The device was to power on using ac power, but not dc power.Pressure applied to the top of the shell caused the device to power off, as reported.The device was able to obtain readings and did alarm with audible and visual status indicators when thresholds were breached.Internal inspection indicated the system circuit board's dc to dc converter (u28) was damaged; causing an intermittent connection responsible for the device shut-down when pressure was applied to the top of the shell.Additionally, the battery was found to be unable to hold a charge.A service history record review reveals that this unit was in the field for over four (4) years with no previous reported issues related to this reported event.
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