J. Kissel reporting for J. Driggers, S. Dwyer, K. Kawabe, J. Oberling [remotely], D. Sigg, and C. Vorvick

Around the time that Keita was replacing the ISS 2nd loop chassis (work permit to be filed, aLOG pending ...), the external shutter for the PSL 70 W amplifier tripped. We (at Jason's instruction) were able to reset the shutter by opening the FLOW RESET screen under the EXTERNAL SHUTTER REQUEST box of the LASER MONITOR screen, and confirming that we want to open the shutter.

The suspicion, informed by previous work on the DBB in the same PSL racks, is that Keita's work in the PSL racks glitched the flow sensor(s), which tripped the PSL's external shutter.

IFO is back on its way up the lock-acquisition ladder, with no harm done -- just a bit of lost time. The lost time was than "usual" because 
   - it was exactly over lunch when folks were in-and-out of the control room and thus creating "who's actually fixing it?" confusion, and 
   - both Jason and Peter are coincidentally out; 
let's call it a "learning experience" instead of FAULT.

The true, underlying FAULT, is that any work in the PSL racks glitch the PSL water flow sensors enough to trip the shutter.