There has been something wrong with the ETMY oplev for quite a while now, it says that the optic is moving a lot more than the other test masses, swinging around by more than half a micro radian. This must be false, and needs some investigation.
Looking at the SUM out of the oplev at 2 different times, it seems like there may be an issue with the laser. The first attachment shows the ETMy SUM signal from a period in April while the second shows the same signal at the start of July (y axis is counts, and the scale is the same between the two pictures). As can be seen the SUM signal is noisier now that it was back in April. This could be what is causing the issue Sheila reports above. We can swap the laser at the next available opportunity to see if this fixes the problem.
