I and Daniel went to EY and tested WFSB using AM laser, and we saw that some of the channels were a factor of 5 or so smaller than the others.

Eventually we tracked it down to the WFSB whitening chassis (S1101602) though I thought it was working OK on Thursday (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12138),

We tested S1101601 that was pulled out earlier this week that was suspicious unit but was never conclusively diagnosed bad, and it didn't work. So we got another spare unit (S1101638) from the corner station and  put it in.

What are in use now: S1101600 for WFSA, S1101638 for WFSB.

Bad units: S1101601, S1101602, S110163.

Bad ones are put on a table in EY.