We found ETMY moving about a factor of 10 more (mostly pitch), as seen by the OPLEVs, as well as with beam spot motion. In addition the DAC noise level was increases. Similarly the IST GS13s showed at least two sick channels (higher DAC noise, ratty, 10x higher signal at lower frequencies.) After chasing our tail for about 4h, Dave suggested a remote power cycles.

Thus Jim remote power cycled all EY front ends, and we restored them to Friday's burt settings. That fixed the sick channels, and the arm locked right up with no extra motion.