H1 dropped out at 6:15 for unknown reasons (seismic quiet & Strip Tools looked fine).
Attempt #1: Guardian stuck at Check IR. So, moved ALS PLL DIFF OFFSET slider until Yarm power started flashing. Then Guardian continued. Engage ASC Part3 seems to be a bit of a time sink here (it took about 6min for the control signals to take over). Had a lockloss during the Reduce Modulation Depth step.
Attempt #2: Nutsinee was in early for her shift so I handed over the ifo to her. She mentioned watching Jenne run the A2L script, so she will give it a try during her shift.
I also asked Nutsinee to take a look at the previous locklosses since she has experience running lockloss tools.
I took a quick look at this particular lockloss and it seems like PRC2 P was growing prior to the lockloss. The zoomed-in version of the same plot doesn't tell me much except that DHARD might be glitchy prior to the lockloss. Looking at the LSC channel list it seems like POPAIR RF90 and ASAIR_A_LF glitched right before the lockloss. The Witness channel list tells me that SR3 is likely responsible for the glitch.
I don't really have a conclusion here. Just reporting what I observed.