June 23, 16:30 CDT
Tom, Kurt and Dan Rajewski are at site 3 in order to remove the krypton 1393 and install a Licor 7500 (S/N 813).
Dan wants Licors at 1 and 3, and kryptons at site 2 and 4.
They dropped the tower sometime after 15:00 CDT and raised it again at 16:05. The drop time is a guess.