The new Debian9 environment was missing the LIGO_RT_BCAST variable, which prevented diaggui and awggui from selecting EXC test point channels for excitation. I have opened an FRS for this

https://services.ligo-la.caltech.edu/FRS/show_bug.cgi?id=11637

The problem has been fixed.

In addition to adding this environment variable, we also installed the pydotplus packaged needed for guardian graphing, and defined the 'z' alias to cdsutils.