(b)(4).Returned for investigation was an autocat2 pcs assembly (p/n: 96-3006-001, s/n: (b)(6)).Visual inspection of the pcs assembly was per formed and no abnormality was noted.The returned pcs assembly was installed into a known good autocat2w for functional testing.The system was powered up successfully.The pump alarmed for purge failure (5) when pumping was initiated.The pcs assembly was then re moved from the pump.All valves were individually tested by powering them on and off using an external power supply, and the vent valve v1 did not respond when the power 12 vdc was applied.Visual inspection of the pcs assembly internal hardware was performed.The release spring in the vent valve was stuck.No other abnormality was noted.A device history record (dhr) review was conducted for the serial number/lot number with no relevant findings.The device passed all manufacturing specifications prior to release.The risk is acceptable.This will be monitored for any developing trends.The reported complaint of "purge failure alarm" is confirmed.The release spring inside the vent valve was found stuck which can cause the alarm.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 release spring being stuck inside the vent valve.The root cause of how to release spring became stuck is undetermined.No further action required at this time.This will be monitored for any developing trends.Other remarks: n/a, corrected data: n/a.
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