Appreciate the help Roibeard. Any other info you've got on it you can send to terry at axisft dot co dot.uk
Hopefully the info you've given should point me in the right direction

Interruption in pulse series from steering sensors 1 and 2. Driving is blocked and the truck is braked to a stop with the motor brake


Check can bus resistance, it should read 54 to 66 ohms. Check the steering servo.
For more info send me your email.