Koji, Craig

We had a nine hour lock today.  Koji and I went out on the floor 10:20 UTC in order to measure CARM and IMC OLGs and spectrum, and killed it by the time we had walked around to the PSL racks.  
We were aware of the possibility of lockloss, and took great care to be as nimble as possible, so this is not great, completely prohibitive to in-lock rack work.

In the recent past, we had not been so sensitive to LVEA incursions during full lock.  Not sure what has changed.  All LSC, ASC, and dither loop error signals seem within reasonable range.  IMC_F has a large excursion to -400 kHz directly before lockloss, simultaneous with our excursion.  Most likely possibility in my mind is us walking around disturbed the IMC.  Have there been any changes to HAM2 or 3 isolation?