Things were quiet. Then Stefan arrived, and I realized I had set the observatory mode but forgot the Intent Bit, and which spiraled into a bunch SDF differences. The LSC guardian showed a difference on a t-ramp (annoying that this kind of difference would keep us from going into Observe) and ASC had two diffs that I guess Evan logged about last night but didn't accept. Then Stefan went and set a bunch of ODC masks (this also would have kept us from going into observe, so also annoying) as well as tuning the whitening the IM4 QPD (which was saturating, Stefan assures me is out of loop so shouldn't affect anything). Guardian recovered from the earlier lock loss in 20 minutes (not annoying!) back to 70 mpc and it has been otherwise quiet.
We just came out of Observe for a minute so Stefan could set more ODC bits. Service has resumed.
The ODC status should not affect OBSERVATION READY in any way. If it does, then ODC is misconfigured and needs to be fixed.
SDF is unfortunately looking at all channels - including ODC mask bits. When anyone updates the ODC masks, the SDF goes red, and you then havta accept the ODC mask channel value in SDF, or ignore it. Again, it's a one-time thing to update these ODC values, just late in the game and not all at one time.