wow! 500k miles!Consider investing in a tune such as GDE that turns off EGR and better manages Regens & DEF usage. I believe you will dramatically reduce your risk of having emissions issues especially when regularly using your truck for short commutes.
In fact due to this I believe you will reduce risk of catastrophic bearing failure due to stopping or minimizing bearings oil/lubrication starvation due to soot-sludge, and wear due to hard carbon particles (compliments EGR/EPA) And bearings lubrication from diesel in oil dilution (over 2 percent) from a poor regen strategy and or faulty emissions equipment. IMO that blame can be shared between EPA & FCA.
Full disclosure I have no vested interests in GDE but I have been using their tune for nearly 500,000 miles and their transmission tune since it came out.
PS if post warranty your cooler fails again or leaks coolant Sasquatch sells an EGR cooler delete kit and for a $50 upgrade a GDE tune can eliminate error codes etc associated with deleting the EGR cooler.