(b)(4).The service engineer (se) evaluated the ventilator and verified the reported malfunction.The unit failed the power on self-test (post), and the system would not load the parameters or settings.The se tried to reset the system and it would not power off or reset.A software reload was unsuccessfully attempted.The single board computer (sbc) printed circuit board assembly (pcba) was removed and replaced.The ventilator then passed all tests, calibrations and was found to be operating within manufacturing specifications.
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