The adaptive feed-forward for the 50 Hz line has been switched off (just in case) by sending 0 to the WI DSP; the old sensing is left commented in the Automation.
The test (active common mode noise subtractor) has been done this morning, but had no visible effect in 50Hz and 150Hz lines.
We have then decided to roll-back everything (END mirrors as well INPUT mirrors); now the situation is the same as before Feb 22nd (see entry 44973)