Richard found that the actual problem was the loss of the CER Cisco network switch sw-lvea-aux. Its power supplies are both showing fault lights, there are leds lit on the rear but the front of the switch is not showing activity lights except SYST is flashing.

Fil is power cycling the unit with a "cords out" power down.

The backup POE Cisco sw-lvea-aux1 may have to be pressed into service if we cannot get aux working.

I looked at the CS mains power monitor, nothing suspicious was happening at this time.