Georgia, Kevin, Corey, Craig, Matt, Caroline, Julia First thing done was to turn off the ADS PIT3 Pitch loop, as we still have a massive offset on IX SPOT GAIN. Plan is to remove this before going up by walking the alignment. We'll check the phasing of the REFL WFS as well. INP1 P is on REFL 9 I, while CHARD P is on REFL 45 I. OMC is not actually sweeping, and so is not locking. Georgia has found that the PZT2 monitor is not reaching the high voltage levels that it usually has during OMC_LOCKing. We went to the mezzanine and found the HAM6 PZT driver power supply was stuck in constant current mode (first pic). Georgia flipped it off and on and it fixed itself (second pic). Now the OMC is locked again. Someone serious should look at this. Started to phase POP X WFS using a frequency line at 8.125 Hz. We engaged all the Notch8 filters. All POP X segment phasings are around -23 degrees or so. We were unable to put all the signal in I using the frequency line. Then we switched to using PRC2_P_SM_EXC for the injection line. This was a lot more fruitful. Matt and I rephased segments 3 and 4 to reduce the PRC2 P signal in Q. The phases are pretty different between segments, but overall they are close to what they were before... These changes were saved in SDF. We reset the IX SPOT GAIN to 0.85, which put the ADS PIT3 error signal back to around 10. Our problem is if we zero this PIT3 error signal with the current alignment, we lose buildups and eventually kill the lock. Our goal is to walk the alignment to zero this signal without losing lock. Georgia opened INP1 P, which control IM4. Julia and Georgia are walking IM4 and PRM together now, with PRC2 and CHARD P closed to try to point us back on the center of the ITMs for powering up. We lost lock while walking IM4 P in the negative direction, and recovering with PRM. We were about to switch directions we were walking in when we died.