During investigation performed at zoll, the lcd screen of the returned autopulse platform (s/n (b)(4)) was not readable in the dark by the zoll service personnel.The root cause of the observed issue was the defective processor board, likely due to wear and tear.The autopulse platform was manufactured in (b)(6) 2013, and it is over 7 years old, beyond its expected service life of 5 years.During visual inspection of the returned autopulse platform, no physical damage was observed.The autopulse platform passed the initial functional test without any fault or error.Load characterization check was performed and verified that both load cells were functioning within the specification.During functional testing, it was noted that the backlight of the display flickered briefly when the platform was powered on, and it went dark afterward.As a result of this, the lcd was unreadable in the dark.During open case inspection, it was noted that the cable connecting the lcd to the processor board was damaged.The lcd was replaced, and the damaged cable issue was resolved; however, the backlight issue persisted.The processor board was replaced to remedy the lcd backlight issue.Following service, the autopulse was subjected to the run-in test using the 95% patient large resuscitation test fixture (lrtf) with good known test batteries until discharged without any fault or error.The brake gap inspection was performed and verified the brake gap was within the specification.Load cell characterization test was performed and confirmed both cell modules are functioning within the specification.Historical complaints were reviewed for service information related to the reported complaint, and there was no previous history of complaints reported for autopulse platform with serial number (b)(4).
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