The reported event was not reproduced during functional testing of the autopulse platform (sn (b)(4); however, confirmed during archive review.Review of the archive data retrieved from the platform revealed a system error 139 (unable to hold compression position) error message; the root cause was due to the defective drive train motor brake assembly air gap being out of specification.After readjustment of the brake gap to specification, the platform was functionally tested including the load characterization check and passed the testing.The platform operated with continuous compression without any issues or error messages observed.As part of routine service during testing, the platform was examined and found physical damage on the short black cover and the drive shaft exhibits binding and resistance.These observations are unrelated to the reported complaint.Historical complaints were reviewed for service information related to the reported complaint and there was no similar complaint reported for autopulse with serial number (b)(4).
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