I did a preliminary test of the effect of hot electronics near the beam path on the PSL table (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=31190). The plot shows an apparent increase in range after the move from close to the beam path to further away, with the move indicated by the spike on an accelerometer. I used a quick intrusion into the PSL, moving very quietly and with 50% fan speed and 100% makeup air, and we didn’t loose lock. There was a broad band decrease below 100 Hz, but also a decrease in a peak at about 65, so I am not completely convinced. I need to do multiple close/far cycles to be convinced, but we didn’t have time. In any case, I left the PZT power box in the far position.