ISB 6.7 Too Much Soot Guidance

[Craig]

Hello All, long time lurker, trying to learn as much as I can but I'm stuck and was hoping to gain some insight. I've been trying to help a friend with his rollback but I'm at the end of my knowledge base. Here's the details and what we've tried so far.

2015 Freightliner Rollback with an ISB 6.7
Issues:
Dash lights up like a Christmas tree with MIL, Regen and Stop lights.

What we've tried:
Removed the aftertreatment filter and pressure washed it out.
Removed the EGR Valve and cleaned it up.
Connected Insite and retrieved several codes: 1922, 3375, 3383, 2639 and 1921.
We cleared the codes and did a DPF reset.
Did a manual regen, this took about an hour and twenty minutes to complete.
Then took it out for a drive and everything seemed to be fine.
The very next day, the dash is lit up again and it goes into limp mode :(.

As I've read many times on the forum per Rawze, the filter isn't making any soot. So I was wondering if anyone had any ideas where we should start to try and figure out why this thing is creating so much soot.

Thanks for any insight you guys might have!

Craig

I have several insite files if that would help. I'd really like to learn as much as I can about this so if he needs help I can actually contribute.