Locked in LN2 and enable BS TX in full bandwidth by hand
This made the loop to start oscillate at ~0.45Hz and after ~30s saturate B1s and cause an unlock

Figure 1. Loop oscillation at ~0.45Hz starting immediately when engaging BS TX in full bandwidth with the detector in LN2.

Relocked to LN2 at 18:42 UTC and stayed there for ~20 minutes, then
continued to LN3 as some slow oscillation was starting to grow with a
period of ~30s. All the inverse pendulum are in yellow state, so this
is probably an earthquake arrving. So these data is not a good
reference to judge if LN2 without BS TX in full bandwidth is a stable
interferometer state.

19:10 UTC (4min) reference data at beginning of LN3

~19:19:40 reloaded SWEB_LC config instead of external by mistake

19:15 UTC (4min) - SWEB TX injection, 1e-2 amplitude, 20Hz-1kHz bandpass, clearly excites narrow resonances on B8 DC but not the ~120Hz bump
19:21 UTC (2min) - SWEB TY injection, 1e-2 amplitude, 20Hz-1kHz bandpass, nothing visible on B8
19:24 UTC (4min) - SWEB TY injection, 5e-2 amplitude, 20Hz-1kHz bandpass, many resonances on B8 DC excited, but not the ~120Hz bump
19:29 UTC (4min) - SWEB TZ injection, 1e-2 amplitude, 20Hz-1kHz bandpass, clearly excites narrow resonances on B8 DC but not the ~120Hz bump
19:34 UTC (3min) - SWEB Z injection, 1e-2 amplitude, 20Hz-1kHz bandpass, nothing visible on B8
19:37 UTC (4min) - SWEB Z injection, 5e-2 amplitude, 20Hz-1kHz bandpass, clearly excites narrow resonances on B8 DC but not the ~120Hz bump

19:43 UTC (4min) - reference period with no injection

I will try to add tomorrow clear spectra of B8 DC during the various injections.