Was alerted at 8:49UTC.
Guardian was having trouble with automatic initial alignment due to ALS_XARM being stuck at CHECK_CRYSTAL_FREQ with no valid state to jump to afterwards.
I hit "Load" and restarted initial alignment and waited until Guardian got past this stage in initial alignment, which happened around 50 minutes later at 9:30.
Things seem to be working now so I set guardian/IFO_Notify back to self-managed and expect to be called again if we get stuck for any other reason.
The CHECK_CRYSTAL_FREQ state in ALS_ARM's (XARM) code which checks on the H1:ALS-{ARM}_FIBR_LOCK_BEAT_FREQUENCY channel threw an index error which I thought I had handled but apparently not, so I added a try-except error handler to the loop where it checks the list of frequency spots to check index and I also added a sleep timer because it looks like it fixed the issue and had the beatnote within tolerance twice but then kept going and changing the frequency which worsened the beatnote and brought it out of tolerance, it just flashed through it? Hopefully the sleep timer will help with this, I'll think more about how to make the code better.