How many miles? My only concern is for the DPF filter. I would have Cummins update the ECM for the latest versions. Based on the dumpster full of the filters they did have considerable growing pains and passed that pain onto the consumers. Extended warranty companies followed suit and did not cover them.
I suspect it is around 4-5K to have one diagnosed and likely replaced today. Perhaps a good ECM update and a DPF filter cleaning to remove any concerns.
My regenerations have been totally different since they updated my ecm and have had no further problems.
Around those years there was a newer version thermostat that came out. Easy enough to change.
If the RV has say 50K miles on it and a service history I would not worry about much but as always, feed the maintenance budget well. These things eat $100 bills.
Myron & Deborah
08 HR Endeavor 40 SKQ
2016 Ford F150 Limited V6 with Ready Brake
Aluminator tow bar, Demco base plate