Investigation results for the returned platform as follows: visual inspection of the returned platform was performed and found no physical damages to the platform.The platform failed initial functional testing as it exhibited a user advisory (ua)12 (lifeband not present) when it was powered on.A review of the platform's archive was performed and found no errors or anomalies on the reported event date of (b)(6) 2015; however, multiple ua 12 error codes were noted to have occurred on (b)(4) 2014.The washer spring in the driveshaft slot was replaced to remedy the customer's reported complaint of the platform exhibiting ua 12.The platform underwent and passed all final functional testing.In summary, the customer's reported complaint of the platform exhibiting a ua 12 message was confirmed through review of the platform's archive and upon initial functional testing.The root cause of the platform exhibiting the ua 12 was determined to be a worn out washer spring in the driveshaft slot, which did not allow the lifeband to lock into place.The washer spring in the driveshaft slot was replaced, allowing the lifeband to lock into place and the platform to function as intended.The autopulse® was designed to exhibit ua 12 to prevent patient harm.
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