(b)(4).The field service technician (fst) has been sent for further investigation.According to service order following works has been done: the fst detected that the control pcb became damaged.He replaced the defective control pcb with a new one.Furthermore, the field service technician checked the pump motor speed, the flow regulation and performed functional tests.He verifies that the rotaflow console meets factory specifications and checked interventions.The fst completes preventive maintenance with full calibration, functional testing and safety check to factory specification.The device is back for clinical use.Thus the failure could be confirmed.
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