Welcome. The service electronic control message could be a million things as we've found out here. Since your exhaust is 100% full you'll likely need a trip to a dealer for a forced regen (unless you have the advanced scan tools yourself). I would start there, and hopefully the service ETC light...
If I remember correctly, that wiring harness/module can be exposed and cause random issues like you mentioned. I'll try and find some posts.
Glad they took care of you and found the problem though!
Welcome. I'm not to familiar with HP tuners (I've only used EFILive), but the tuner that created your files might have some more insight if that's the platform he uses. Otherwise, a nice scanner might do the trick. I do wonder if you don't have a tuning issue if you're still getting the pop up's...
Diesels in general aren't "money hogs". The only extra maintenance in general is around the fuel filter (most guys change those every 15-25K).
Newer modern diesels do have emissions issues to overcome sometimes. Sometimes you find a good healthy truck, and sometimes you do not.
Welcome to...
Welcome!
I'd recommend reading through some threads here:
https://www.ecodieselram.com/forum/forums/ecodiesel-performance.28/
Plenty of reviews and opinions on the tuning matter. :)
Welcome! You're gonna get mixed reviews on that for sure, I'd recommend this section and look at a few threads:
https://www.ecodieselram.com/forum/forums/ecodiesel-settlement-information.36/