Chime 2nd Gen Flashing red / green light

Installed ring doorbell and chime at the weekend. All appears fine both devices working. I do have a question about the indicator light on the new generation of chime as I can find nothing in the very limited user manual plug the chime in I get blue flashing light that eventually turns to a solid blue light just like the advertising pictures. After a while however that solid blue light turns to a flashing green/red light and remains such until the chime is pulled out of the socket and put back into the socket what does the flashing red/green light mean as the manual is of no use here? chime rings if doorbell used, chime rings if test chime used from ring app, ring app healthcheck says device fine working ok, WiFi connected, rssi -33, firmware up to date etc so everything appears fine apart from the flashing red/green front light