Thanks for reply ErichO, tried that first of all but it was tight, all good.

I'm begining to wonder if 1 of 2 things have happened here;

Scenario 1;
I've "created" this fault by replacing the main hydraulic controller and do the load sense settings on the new controller not match the truck?

Scenario 2;
This was the original fault all along and hydraulics overheated causing the initial error codes of A5 A6 and caused the main hydraulic controller to crap out in the first place?

Obviously there was no way of telling what the hydraulic functions were doing before we replaced the hydraulic controller as we originally had no hydraulics to test.