Hole in DPF housing causing problems?

Can you post a year and a mileage of the truck?? And what kind of work your truck does??

 

Have you cleaned EGR cooler, Venturi tube, and checked EGR delta P sensor and tubes for plugging?

 

High NOx is either a bad DOC, in this case the inlet and outlet NOx sensors would read similar values. Or high combustion temperatures either caused by injector issues or insufficient EGR flow.
Cleaning the EGR system is something you could do yourself for free and if you find that the venturi tube or cross over pipe are plugged. You could solve this issue.
Don't know for sure if this is your issue, but worth the effort.
Just watch some videos on YouTube, lots on there for other engines, Mack would be similar process.

 

Another potential cause. This past winter I saw NOx rates like yours when my DEF line to the doser froze and broke off. So I wonder if the DEF doser flow is blocked, or maybe the DEF fluid filter is plugged. Some systems have other finer filters at the inlet of the doser.

 

I don't know what the problem is but it seems that a visual inspection should have been the first thing they did to find the hole. I don't guess you have much recourse now but I wouldnt be happy.

 

Need to check all emission sensors for soot covering. Need to clean out all differential pressure pipes with carb n choke clearner. First

 

Got a picture of that hole? Is that on a bottom of dpf filter housing?? On a D13 you can buy bottom housing for around 600-700 dollars. Do you need to move this truck to your home state??