Futaba 3GR/603FF - Unbound itself and refuses to bind

[brizzlemark]

This combo has been happily operating in my car for the last six months till today.

Car suddenly stopped on track, on inspection receiver light was glowing continuous red.

Tried rebinding in line with manual, deleting all memories from transmitter etc with no success. Light on rear of transmitter is showing a continuous green indicating it is OK.

Is there a way of fault-finding this without spare kit? Anyone got any tips on how to fix this?

I suspect a failed receiver.

Cheers
Mark