Complexity of Replacing Wiring Harness on a 6.0 E350

[FunHogUtah]

Help. Has anyone replaced the main wire harness on a 6.0 diesel E350? I have electrical issues on my 2005 E350 4x4 RB50 and have tried repairing the harness but continue to throw error codes. Wire wiggle test keeps confirming it is something in the FICM wires in the main engine cable (I replaced FICM anyway to make sure and the wires are still causing the problems). I’ve found the harness part discussion on the forum which is very helpful but can’t find any details on actually changing the harness. Has anyone changed the main harness out? I know I’ll have to remove the turbo (have done this before) but what else will I need to remove? How big a job is it? Does the body need to be lifted from the frame? What parts need to come off the front side of the engine? Any specifics on this would be very much appreciated. Thank you.