West PP5 TT23 which corresponds to EQ1 board 6 channel 7.  This tile was out during run 21.  Prashanth found that the wire going into the QT board had gotten loose from the connector. He pushed it back in, so it works now.  This blog post was then unneeded, and I explain the issue again in: drupal.star.bnl.gov/STAR/blog/rjreed/results-2021-epd-install