19:44 UTC Change ITM Yaw from 0.0.
    0.2
    

    increasing gain of ADS YAW 3 from 1.0 to 5.0
    SRC1 PIT and YAW gains are also high to speed things up.


Interesting progress save point
20:15 UTC


20:20 UTC 
    Hold at ITM Yaw 3.5. Y TR B is at 0.78 in Yaw -- too close to the edge for comfort.
    start moving in pitch.

20:30 UTC
    Finished with ITMY PIT is at final value of -3.0

20:32 UTC 
    Begin moving IY YAW back to 0.0.
    LHO 50965 -- old values.

20:35 UTC interesting save point for HWS data (high cavity pole, good build-ups, low noise RF9 and RF45.). 
    ITM YAW is only a little bit back to nominal, 2.4
    Hold for ~1000 secs here for HWS data.


    ETM ADS had converged, so side study:
    Check demod phase of ETM ADS. 
     (open the ADS loop so it no longer has an effect on the IFO, change A2L gains by some large value, look at what happens with the I and Q, check that response is only present in I and not Q.)
      You found they were poorly phased . 
      EY PIT is only a factor of two more than I and Q in response to impulse. (I should be much more than Q.)
      EY YAW is also suspicious. Not even a full factor of two difference in response to impulse.

      EX PIT and YAW are similarly poorly phased.
      Note as a FIXME for later. Wait for final gain values of A2L gains before making a fix to this.

  Notice that cavity pole and buildups are quite high.

  We also notice while we're waiting that the high frequency end of DARM ASD is going bad -- maybe is this the same thing as what Corey's been seeing?
  Circa 20:50 UTC

    Time for ITM HWS (20:48 UTC): 1249850898

20:53 UTC end aside.
  Proceeding with continued restoration of ITMY YAW A2L gain to 0.0.

21:08 UTC
    Hold here. ITMY is in final position. ITMX has been move to match it.
    ETMs are NOT in their final position.

    Time for ITM HWS (21:49 UTC): 1249854572
   
2019-08-14 21:12:14 UTC Control room gets alarm for S190814bv (preferring 1249852257, Aug 14 2019 21:10:39 UTC). 

21:20:40 UTC Back to Observe 
    ADS still high, SRC1 gains still high (just accepted in SDF.)

21:40 UTC First alert for EQ in Mexico.

21:43 UTC Switch to EARTHQUAKE mode 

21:51 UTC lock-loss