TC Diesel,
You may be right, it is under extreme scrutiny. And Now Cummings is under fire.
http://fcauthority.com/2016/12/fiat-chrysler-cummins-named-in-another-class-action-diesel-lawsuit/
http://www.detroitnews.com/story/business/autos/chrysler/2016/12/28/fca-diesel-lawsuit/95920250/
Two short articles that supports your thoughts on the 3.0L being under fire. But, to include Cummings, I guess deep pockets? I really want to see where the Cummings allegations go, if they stick and move forward, I suspect you may see Duramax and Powerstroke under the same scrutiny. As they all use the same type of emission control and procedures on how they code software to run the engine cycles and turning on and off components for regen or possible unsafe temperature levels. Yes, they all have different parameters, but they all have the same type of software producing the same type of safety timing cycles. Not defeating the emissions systems but cycling through as aloud by the Reg's.
I cannot support these articles as I cannot validate the claims as reported. There is some validity, you really have to find the government papers and actions taken to see what really is being submitted. So, my disclaimer, it is reported news only.
This aught to be an interesting year for the diesels.