Generic Action:
Select Generic Command > Change User or Group Configuration
Operation > Get
From User\Group Mailbox > {name of group}
Parameter > Service Mode
Select Variable for Result > $SAV (can't be changed)
In Service - $SAV=1 (easy to remember, because 1 = ON)
Out of Service - $SAV=0 (also easy to remeber, because 0 = OFF)
Night Service - $SAV=2 (not so easy to remember, but if it isn't ON or OFF, this is all that is left)