First see if the red lights that you see match any of the descriptions given in this Sonos support link and then go from there…

https://support.sonos.com/en-us/article/sonos-led-lights

If you think you may have a fault and cannot rectify the issue, then if you can get them to appear in your Sonos App, then immediately submit a Sonos system diagnostic report, note any reference, or if you can’t get them setup, contact/chat with Sonos Support Staff via this LINK and see what the Staff can perhaps suggest to resolve the matter.