After giving BRSX a day to cool off, I went to EX this morning to see if I could recover it. This required stopping the Beckhoff and recentering the damper assembly, the latter is not trivial. There are a few variables that need to be cleared in the Beckhoff, and they are kind of buried. But, the EX BRS is functional again, commissioners/operators can return the SEI_CONF to the WINDY state.

While I was there, I used a left over iLIGO hockey puck to damp the BRS down enough to re-engage the damping. I couldn't find Krishna's diagnostic plot, but the driftmon overview gives enough information, when the BRS is rung up enough to see on the driftmon (this plot is usually flat, it only goes sinusoidal if the BRS is rung up a lot). For future reference, you can do this by holding a mass above or below the beam, depending on the direction of the driftmon. Watch the driftmon signal and when it starts swinging in a positive direction (when it's at it's largest negative value of the sine wave) hold the mass above the right (-X) part of the horizontal part of the BRS vacuum can. Hold the mass below the can when the driftmon starts moving the other direction.