High Availability Distro Upgrades Sysadmin Pro

Distro Upgrades from Sysadmin Pro. Can those be done from the GUI on a High Availability system as well?
If yes, will it upgrade the slave node too?

As long as its a minor upgrade (i.e. -6 to -7), Distro updates are easily done using the method outlined here:

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Are there release notes on these upgrades anywhere?

Yes they are here: http://wiki.freepbx.org/display/PPS/10.13.66+Release+Notes

How important is the Cleaning up files from a RPM update? still necessary?