TLDR: H1 would not lock due to alignment changes imposed earlier in the day, so after bringing alignment back, green references were updated and H1 returned to observing at 12:01 UTC. For OPS - An initial alignment MUST be run after the next lockloss due to updated green references.

H1 called for assistance at 07:48 UTC as it could not relock on its own (still trying to recover from Corey's shift). I discovered that H1 had run an initial alignment automatically, but every time it would lock DRMI, the ASC (specifically PRC1_Y) would pull alignment the wrong way. I first tried simply turning off the PRC1_Y loop, which worked to get through DRMI ASC, but then there would be a lockloss somewhere before or during ENGAGE_ASC. One of these times at ENGAGE_ASC, I paused in the state previous and went through ISC_LOCK line-by-line to turn on each ASC loop one at a time, but I eventually lost lock while turning on CHARD_Y. At this point, I reached out to Jenne for assistance, and she reminded me of the move_ARM_dev.py script in userapps/asc/ which would allow me to converge CHARD_Y before engaging the loop, which went well. I was then able to successfully go through every step of ENGAGE_ASC and continue locking.

While this was going on, Jenne speculated that the green alignment references had not been updated after the alignment changes during the commissioning period today, which would explain why alignment looked so bad following the initial alignment run earlier in the night. So, while waiting in PREP_DC_READOUT, I opened the ALS beam shutters to see if the arm would still lock in green to update the alignment references. Surprisingly, the alignments looked great and quickly locked on the TEM00 mode, so I ran the setEndGreenQPDOffsets_{X,Y}ARM.py scripts in userapps/als/ for about 5 minutes to set the QPD offsets, then updated the ITM camera offsets by setting them to be the average of the camera P/Y positions. All of these values have been accepted in both the SAFE and OBSERVE SDF tables (screenshots attached). Since the green references have been updated, Jenne encourages there to be an initial alignment run after the next lockloss to ensure the references are good. After all that, I re-shuttered the ALS beams and H1 continued locking without issue all the way to observing (sadly just before S250207bg).