Sb6183 receive/downstream only blue light?

I have no internet, I’ve removed all additional cables with the exception of a small 2’ cable direct to the modem and all 4 lights are on but the only blue light is the receive/downstream. 

I have a scheduled tech from xFinity coming in 2 days to check the outside wiring. There were no changes to anything prior to the connection stopping. There has been intermittent outages for months, but they would last for shorter periods of time. 

Why only the downstream receive light?

thank you