ing the Acquisition & Guiding (A&G) unit and
the Cassegrain Rotator. Significant work was
also done on GMOS-South to improve reliability of the mask exchange unit.
Finally, we replaced the large chiller, which
is used for the toughest cooling tasks in the
building (including the air handling units in
the dome itself ). This was a major undertaking. It required a choreographed exchange
between the existing chillers and the new
unit, which enabled the new one to run in a