Red light on my Xfinity Gateway MXB1 wall-mounted modem

I noticed that my wall-mounted (Xfinity Gateway MXB1) modem has a red light (vs. the usual yellow light).  But, as far as I can tell both my internet & TV are working.  I live in a senior community that now (since Feb 2026) receive both of these services as a bundle.  What does the red light signify?  How can I get the "normal" light back on?  The username for my account is VV12-D.