I believe the harness described goes to the fan clutch (most likely to be the issue, and it would throw a code), EGR valve, IAT, EBP. Instead of tearing into the harness immediately, I would first want to know what circuit was impacted. Moving that harness might actually cause movement at a connector, which would be better to address before opening up the harness.
Edit - I guess i read that wrong! It was the IPR harness that you MOVED to the filter area!