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Congratulations - sounds like it has been an adventure so far.
Have you pulled the DPF to inspect & clean it? I'd normally expect to go around 1,000 miles between (rolling) regens on a cross country highway trip - every few hundred miles is a bit of a red flag. Hopefully the thermostat & DEF heater were the problem, but fire trucks & ambulances tend to idle a lot so it isn't unusual for them to start needing DPF replacements as early as 50,000 miles. Still, your engine has pretty low hours for the miles so it definitely wasn't idled all the time...
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