Between 16:54 and 17:30UTC DIAG_MAIN was saying: PSL_CHILLER: Check PSL chiller, but it had stopped alarming by the time I was able to go and check on it around 18:25UTC. ndscope shows that H1:PSL-LASER_CHILLER1_ALARM had been only going off intermittently during that time period, so probably from the water level just barely dipping too low. However when I went to check on the water level, it wasn't dipping anywhere near the minimum and was staying pretty solidly 1/4-1/3 of the way above the minimum (I forgot to take a photo before filling it), but maybe some ground motion or something similar caused it to oscillate below the min during those ~30 minutes. Either way, I filled it to the max line, which ended up being 134 mL. The last time it had been topped off was Oct 16 (73504).