First saw it on the YAW Control strip tool in front of me (1st attachment), but then saw it in the 40min Strip tool as well. It is mostly gone, but can still faintly see it.
W went out of observing very briefly to remove some gain from the ADS yaw loops, who's gain we had increased yesterday. It looked as though this oscillation could be a cross coupling between the ADS and SRC2 loops. Several times yesterday we noted that the SRC2 loops are bringing their error signals to 0 very slowly, so we might need to increase these gains.
Since the gain reduction seems to have gotten rid of the oscillation, I've edited the guardian to keeps the ADS gains lower for now.
The next time the interferometer looses lock, loading ISC_LOCK should make these changes happen.
LOAD was executed at 10:58utc on June 7th.