During preventive maintenance on (b)(6) 2019, the lcd display of the autopulse platform (sn (b)(4)) was flickering and the lcd display turned off.The root cause for the lcd issue was due to the defective lcd and the defective main printed circuit assembly (pca) board.Upon visual inspection, observed flickering lcd backlight and the lcd display has missing pixels and lines.Also noticed that the encoder drive shaft does not rotate smoothly, exhibits binding and resistance.Performed clutch plate deburring to remedy the issue.The autopulse platform passed initial functional testing without any error or fault.Load cell characterization test was performed and confirmed both cell modules are functioning within the specification.The lcd and the pca board was replaced to remedy the issue.Following the 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.
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