Well.. I haven' had mine fall so I don't have any insight to how it's supposed to be behind that panel. but, I have noticed a they're a little slower when its colder but I'm in TN, so we don't get that cold here.
These come from AutoBlog.com .. a few different articles around this, but these are the clearest pictures so far.
https://www.autoblog.com/2017/11/14/2019-ram-1500-renderings-everything-we-know/#slide-7153313
I wish we could put something together that would show what's killing these motors. Guys you've mentioned all have one thing in common, they use theirs A LOT. Perhaps working the motor harder is the key.. I don't know.. most that blow up are just cruising down the interstate from what I've read.
Welcome! Buying a used vehicle, maintenance records are always a plus, but for a EcoDiesel it's a must. Most folks don't have any problems and are over 100K.
Continue to read around.. you'll find different opinions, but remember most folks sign up on a forum to complain.. not brag. :)
Enjoy...