The 60Hz line is *very* bad today. I don't think we noticed it yesterday since we weren't really going to Nom Low Noise, since we were doing TCS tuning instead. But, it's incredibly clear that something happened between Monday and today that has made the 60Hz line very bad. If DetChar wanted to have a look at what witnesses see this, that would be helpful.
I don't think that anything happened with the ETMX ESD power supply yesterday. (It was going to be swapped out, but JeffK asked around, and it doesn't sound like we got that far before the end of maintenance yesterday).
Apparently the ETMY ESD driver had been removed on Tuesday, and the cables were left un-terminated. The modifications to the driver are complete, so this afternoon the driver was re-installed, and now the 60Hz line is much improved.