The following were reviewed as part of this investigation: patient severity, applicable previous investigation(s), sample(if available), applicable fmea documents, labeling and applicable manufacture records.Based on a review of this information, the following was concluded: the device was returned to the service facility for evaluation.During evaluation, the reported issue of users find a vessel and then hold the probe still and the image slowly drifts off to the left was unconfirmed.During inspection the t90935 accuracy test fixture was used, the scanner passed all test and were within specification & tolerance, with no observed "drifting".The root cause of the reported failure is inconclusive as the reported issue could not be reproduced during evaluation.No other functionality issues with the equipment were found during evaluation/servicing.The device was serviced, tested and returned to the customer.A history review of serial number (b)(4) showed no other similar product complaint(s) from this serial number.
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