US/DS Light Off - Services still working properly

The US/DS light is out on my gateway modem but my internet service is working properly.  This has happened two or three times now and seems to coincide with service being done in or near my neighborhood by the Xfinity technicians.

Not sure if this is a sign that the gateway is about to go going out (all of the connections seem to be ok) or if this is something related to the service calls in my area?