Last week, RobertS and I determined that the North and South PSL table temperature sensors are mislabeled.  North is really South, and vice-versa.  

The South sensor (EPICS channel calls it North) was mounted close to the two major heat sources in the Laser Room that are not water cooled: the TTFSS servo electronics and the ISS AOM driver (see "before" photo below).

Today, I moved it approximately 2 ft. to the West so that is not located on the South-West corner of the table, and away from the heat sources (see second photo attached below).