Arris SVG2482 Modem. MOCA is off

Tje manual states

MoCA LED:
‎ON – MoCA is enabled
‎OFF – MoCA is disabled
‎Note: This is a Comcast feature along with other components that Comcast must install.

Are they installed?

MOCA LED used to be on.  Presently it's off.  How do I get Comcast to fix it?