Upon arrival I found ITF stable in Science Mode (LN3_SQZ).
At 13:29 and at 13:33 UTC the SQZ unlocked, relocked at first attempt in both occasions (Science Mode set) but at third failure I contacted SQZ OnCall who checked on it. (Science Mode with ITF in LN3). The issue was related to the humidity level in Det Lab.

DET
13:39 UTC - DetMoni VPM process restarted under request of Gouaty.

At 14:24 UTC I set ADJUSTING in order to allow:
- ACS experts to fix the problem on DET Humidity. Activity concluded at 14:40 UTC. The steam producer was blocked. Soldani pointed out to me that the ENV DMS flag (ENV..SQZ_BOARD_HU) values are not "aligned" with the INF DMS flag (HVAC..DET_HU_IN).
- VAC experts to go at NE to check a CryoTrap valve. Activity concluded at 14:45 UTC.
- ALS Gosselin to reboot green ALS Laser but unfortunately the optic amplifier is not responding anymore. A replacement is planned for tomorrow morning -> AT NEXT UNLOCK WE ARE NOT ABLE TO RELOCK !

15:21 UTC - ITF again in Science Mode

CAL
In order to avoid the risk of ITF unlock, Was asked me to perform "only" 10 times the CALIBRATED_DF_DAILY.
19:00 UTC - ITF set in LN3 (CALIBRATION MODE) Also L1 and H1 DOWN.
- Calibrations started at 19:01 and concluded at 20:54 UTC
LN3_SQZ / Science Mode at 20:55 UTC.

Oncall events

SQZ
(19-04-2024 14:00 - 19-04-2024 14:25) From remote
Status: concluded
Description: The result of check of the SQZ failure was due to the humidity in DET area ENV..SQZ_BOARD_HU.

ACS
(19-04-2024 14:25 - 19-04-2024 14:45) On site
Status: concluded
Description: Det Humidity intervention by ACS Expert OnCall, steam producer restarted. Humidity values again in threshold.

ALS
(19-04-2024 13:00 - 19-04-2024 15:20) From remote
Status: concluded
Description: The issue was at level of optic amplifier. Aymeric contacted ISYS OnCall expert (C. DeRossi) who will come on site tomorrow morning to replace the device at WE with a spare one.

TCS
(19-04-2024 16:36 - 19-04-2024 17:00) From remote
Status: concluded
TCS_WI_CO2_PWROUT out of range. Nardecchia asked me to change the DMS thresholds.

Guard Tour (UTC)
17:01 - 17:40
19:01 - 19:28