Both lock loss plots show H1:OMC-DCPD_SUM_OUT taking a sudden drop before any other channel shows a glitch.
LL@07:37:06UTC - zoom on OMC-DCPD_A_OUT and OMC_PZT1_MON_AC_OUT.
There's something in PZT1 on the plot just after 2.354 on the x axis, where I put the blue cursor, that may be the first glitch.
It's also clear that PZT1 takes off before the OMC-DCPD.