Peterbilt 367 power loss/OBD connection problem.

Hi y'all! I would be very appreciated if someone could help to figure what is going on or somebody has had this problem. I bought 2017 Pete 367 (MX13 with eaton fuller automated transmission) off auction and knew there is some issue. I drove off the lot and first thing what is happened - right on the ramp on to interstate truck wouldn't gain a power and there was like no power to shift a gear. Showed up on dash display "Stability control" fault. But in 10-15 sec trucks finally switched to the gear and drove like nothing wrong with it. I thought problem with a transmission but shifts as should. In 15 minutes drive all was good but right before hill truck lost a power and downshifted but wouldn't gain speed/power. I took the truck to local mechanic shop and their OBD Nexiq cannot be connected ( with Intuit app ). Only thing was connected - some tab but showed up some codes related to DEF/DPF system. They checked EGR valve - clean along with cooler. So, I took the truck to Peterbilt dealership, in 6 hours of diagnostic technician came to me with wiring harness issue and advised to replace it. only thing is part is on the back order and nobody knows waiting time. I'm keep trying to find any options with wiring harness but unfortunately no luck yet.
I have reports from Pete dealership below

 

Dealership said somewhere in the harness possibly damaged by corrosion. Truck from Washington state

 

+$1900 labor. I called today them and double checked about required parts - they confirmed only last one needs to be replaced. Now I think to get it ship to my local mechanic shop. I believe there is nothing special that required replace entire wiring harness

 

Update: I brought my truck to CA and get it fixed in 2 days. Took it to local electrician shop in Long Beach. Problem was is a bad ABS sensor and some wirings has been bad contact. Paid less than $1k. Pete stealership wants $10k