This morning I swapped a couple of OpLev Lasers around the site. I took the less glitchy lasers from SR3 and PR3 and replaced the end station lasers that have been very glitchy and vice-versa. All centering remained nominally intact. There was a gain adjustment necessary for SR3. The gain setting was +3dB and it was changed to 0dB. This brought the sum count from ~40K to ~28K. After temperature stabilization, spectrograms will be checked, and if needed, power adjustments will be made to quiet down any "new" glitching.

Unrelated to this swap,  ITMX OpLev, is showing an increase in sum by a factor of 4 (post vent). This remains a mystery until I can go and try effecting a change by a direct power adjustment and/or checking/correcting gain settings at the whitening chassis. Nothing was directly done with this unit directly prior to or after the vent. It is very unusual.