Using a batch file + windows task scheduler. Looks like AGSSOM is not an option (we're using 10.3.1) No need to look at indivicual services, just whole ArcGIS Server Service on a machine, essentially as part of a maintenance window (windows updates done over the weekend occasionally have a detrimental effect on our service).
This seems very straightforward, but am having a hard time finding a way to do this.