This is just copied from Annika:

In multiple channels, the dark current fluctuates regularly. This does not appear to affect the MIP peaks. Original blog posts related to this problem can be found here:

https://drupal.star.bnl.gov/STAR/blog/lisa/some-suspicious-tiles-25-april-2018-iv-scan
https://drupal.star.bnl.gov/STAR/blog/rjreed/dark-current-ew1-pp5-tt27
https://drupal.star.bnl.gov/STAR/blog/lisa/uniformity-and-nonuniformity-ring-ring

Probably we should have talked about this before installation and decided if we wanted to change out FEE cards. Do we want to change out FEEs before the run starts, or are we fine with leaving it as is if the MIP peaks don't seem to be affected (at least so far)?