Daniel, you are correct. The error message mentioned is from the Windows Event Viewer logs. I failed to include that this is an intermittent problem. We run ETLs every six hours that update the file geodatabases in our data-stores. Typically these updates replicate throughout the cluster without issue, but once or twice a week we'll experience a failure.
A review of the Server Event log includes the following:
<Msg time="2015-06-12T14:03:21,597" type="SEVERE" code="9016" source="Rest" process="2952" thread="20" methodName="" machine="RVAVPAPP26" user="" elapsed="">Error getting service.</Msg>
<Msg time="2015-06-12T14:03:21,601" type="SEVERE" code="9003" source="Rest" process="2952" thread="20" methodName="" machine="RVAVPAPP26" user="" elapsed="">Unable to process request. Service Dev/PeopleGroupsOrg_Dev/MapServer not found </Msg>
<Msg time="2015-06-12T14:03:29,568" type="SEVERE" code="9016" source="Rest" process="2952" thread="20" methodName="" machine="RVAVPAPP26" user="" elapsed="">Error getting service.</Msg>
<Msg time="2015-06-12T14:03:29,568" type="SEVERE" code="9003" source="Rest" process="2952" thread="20" methodName="" machine="RVAVPAPP26" user="" elapsed="">Unable to process request. Service Dev/PeopleGroupsOrg_Dev/MapServer not found </Msg>
Once the server is restarted the processes tend to run smoothly for several days, then we'll experience another failure.