SCR Error Torque derate 25%

Three unrelated problems occurring at the same time I strongly suspect you have a wiring harness problem.
I very much doubt there is a problem with the turbo.

 

I would check all connectors that may have been unplugged with the work that you had done.
They may not have plugged something in all the way or broken a wire at a plug.

 

I just spent this morning chasing multiple unrelated engine faults on a newer international LT with an X15 in it. The problem was several broken wires at the emissions fuse/relay box. The fuse/relay box is bolted to a bracket under the floor directly below the drivers seat and moves up and down with the air ride cab. The harness to the fuse/relay box is tied to the frame so the wires are constantly wearing. The wires rubbed through the insulation and corrosion consumed the copper wire.

I can see where this will be an ongoing problem.

 

We have a few RH day cabs that we service. International put out tsb on this. Their solution is to cut any zip tie within 10” of the fuse box.
If I remember right it only affects 19-22 models, but I had a 23 with a cracked fuse not long ago.

 

So how did it ended. I'm going thru same problems, I think

 

I had this happen with a company truck and it ended up being a blown turbo and was spitting oil out the exhaust side. About $12,000 and 6 months later that issue is finally corrected. Fortunately that wasn't my problem I just got put in a Ryder Truck during that time

 

Well it seems that leaking CAC was the problem for me. Don't understand it, but it was replaced week ago, and no derates. Go figure

 

Lots of unrelated codes usually means a wiring problem. However, all the active codes in that picture are exhaust related. So it could indeed be a turbo problem, or it could be just an exhaust leak.

What is an EGR flush? Did they disconnect parts of the EGR system? If so my first suspicion would be a leak.