Parked Regen T660?

I'll add a little personal experience to this.

I have a 2015 Cascadia that we got in June of 2014, so I have had this truck roughly 2 1/2 years & has 161,000 miles. My job is a bit different from typical trucking, in that I am mostly a local driver with some regional within a 300 mile radius.
A typical run for me will be to leave Monroe, La & run 300 miles west to Arlington, TX, spend the night. Get up, scale & unload. I'll do this about once per week. Otherwise I am usually home every night. Because I am not out a lot over night, our best option is no GenPak (etc), but just to idle over night when out.
Therefore, when I am out over night, most of the time I have to do a manual regen the next morning. In the period of 2 1/2 years, it usually takes about 10 minutes.... 15 minutes max... to regen & I am good to go.
I do this about 2 or 3 times a month. If the situation is right, I'll do a manual regen 4 times a month but not normally. Again, 2 or 3 times a month is normal.

About a month ago we had a normal PM done at 150,000 miles.

The first time I needed to regen after the PM, it took about 10 minutes & finished. I drove about 5 minutes to scale & dock. About 30 minutes later, it needed another regen. Its never done that before. So, I started it & it ran for about 30 minutes. That in itself was extremely unusual. It finally finished.

I drove about 45 minutes to my next stop, dropped/hooked & headed toward home. I drove about an hour, stopped for lunch for 30 minutes. When I got back, it needed another regen. This is crazy!
I started the regen & it run about 45 minutes & didn't finish so I decided to see if it would finish as a passive regen. I drove about 4 hours back home, & it had not finished a regen. After dropping the trailer, I started a manual regen & it finished in about 45 minutes.

We took it back to Ryder for them to check out. When I picked it up, they said that it should take about 45 minutes to do a normal, full regen. However, in 2 1/2 years & 160,000 miles, doing a regen 2 or 3 times a month on average, its never taken over 15 minutes max... normally 10 - 12 minutes.
They said in my case, they had to remove an injector & do something, then replace it because, apparently (& I didn't know this) in addition to the DEF, the regen process, squirts a little diesel into the process to assist in the heating process. In my case, when they did the PM, they didn't get something right when they did whatever they do to the injectors at 150,000 mile PM, therefore the regen process wasnt getting enough diesel to heat up the system to burn out the (soot) & finish the regen process.

Or something like that.....

Hopefully this may help you.