Thanks to both tonym and XRaySpeX -- it appears the red led shining is usual. I later discovered a problem in the auto-document feed, 2 plastic gears had split on the stepper motor.
Both repaired, but bad luck continued it still periodically flashes internal problem. The black head is also partly blocked and efforts to clean resulted in the dreaded "Ink pads reaching end of life"
I know this can be reset and pads cleaned, but I think it's a lost cause, it's going in the bin. My experience of this printer has not been a good one!