During preventative maintenance (pm), the autopulse platform (sn (b)(6)) failed functional testing and displayed user advisory (ua) 07 (discrepancy between load 1 and load 2 too large).The load cell characterization test procedure failed, revealing that load cell #2 was malfunctioning.The root cause of the ua07 was the failed load cell #2, likely attributed to the age of the platform, failed component(s), or mishandling, such as a drop.The autopulse platform was manufactured in (b)(6) 2011 and is almost 13 years old, well beyond its expected service life of 5 years.The malfunctioning load cell was replaced to remedy the ua07 advisory message.Upon visual inspection, a hole was observed in the load plate cover that would affect the watertight seal, unrelated to the noted issue.The likely root cause for this physical damage is user mishandling.The load plate cover was replaced to address the problem.Following service, a brake gap inspection was performed and verified the brake gap was within the specification.Another load cell characterization test was performed and confirmed that both cell modules were functioning within the specification.The autopulse platform was subjected to a final run-in test using the 95% large resuscitation test fixture (lrtf) with known good test batteries until discharged without fault or error.Historical complaints were reviewed for service information related to the reported complaint, and there were no similar complaints reported for the autopulse platform with serial number (b)(6).
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