In order to investigate possible noise sources, the following devices were turned off in TCS room:
- devices to control the plates on CO2 benches (15:05 LT);
- preamplifiers power supply (15:09 LT);
- flip mirrors suppliers (15:11 LT).

Moreover the PSD and power detectors on both CO2 benches were turned off too (15:17 LT on WE and 15:24 LT on NE).