Hi Everyone
Firstly thank you for your help information and input with my problem.
I can now report that the machine as been running now with no faults or error codes showing.
The problem seemed to be related to bad insulation on the main wiring loom and this was found after removing all wiring from truck and checking every individual wire on the loom, after checking !! the insulation was replaced and the loom refitted to the truck. After this the codes never returned so fault finding was put on hold so we could monitor the truck. Three days now and No faults, compared to every other couple of minutes before.