I was up on the Mezzinine measuring for cables and noticed that the pumps were not turning. No level trip, no VFD trip, servo running pushing max volts. Richard reminded me of a problem that we should have corrected some time ago. The output from the servo has 4 BNCs to the four pump stations. There was a bad BNC that has shorted in the past and it did so again. Once it shorts, no matter what the servo does, the outputs are shorted and the VFD gets zero volts hence no revs. As soon as I unplugged the bad BNC they rev'd back up. We took it back down and Filiberto replaced the BNC. This should not happen again. I may have bumped the cable and caused the short but I'm pretty sure it happened 10s of minutes before I was in the area. The pumps went down at ~1818utc and the BSC2 HEPI moved a fair bit, several .001". After the BNC repair I got the Pump Output back to operating pressure ~2040utc with the HEPI Actuators reaching equilibrium position a few minutes later. The difference in before & after position at BSC2 was ~0 to ~600 counts, all less than 0.001". Obviously a need for alarms--working on it!