(b)(4).Returned for investigation was an ac3 pump assembly (p/n: 33-3200-001, s/n: (b)(6)).The part was returned in a pump assembly shipping box with protective shipping packaging.Visual inspection of the sample was performed, and no abnormality was noted.The returned pump assembly was installed into a known good ac3 for functional testing.The pump was powered up successfully, and no abnormalities were noted on the screen.Pumping was initiated; however, the motor was heard continuously turning and then the pump alarmed "system error 3 (1)".The pump assembly was removed from the lab inventory ac3 and the top outer housing of the pump assembly's bellows box was opened to further investigate.The washer that connects to the bellows plate was noted to be misplaced.Upon initiation of pumping, the leadscrew spins continuously without engaging the bellows.Note: this is the original pump assembly for this pump.A device history record (dhr) review was conducted for the lot number/serial number with no relevant findings.The device passed all manufacturing specifications prior to release.The reported complaint of system error 3 is confirmed.The pump alarmed system error 3 during the complaint investigation.The leadscrew was found disengaged from the bellows.Based on a review of the device history record (dhr), the product met specification upon release; however, the received product did not meet specifications during the complaint investigation due to the disengagement of the leadscrew to the bellows.The most probable root cause is manufacturing related.This will be monitored for any developing trends.Other remarks: n/a.Corrected data: n/a.
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