A26 International white/blueish smoke from exhaust

I believe you will tend to get white smoke when the DOC is starting to break down. If the DOC has never been replaced then it's a possiblity with the mileage you've put on it.

@Heavyd knows far more about that engine than I do.

 

That code is basically saying the regen was successful, but the soot load is still high. You are likely looking at replacing the DOC due to the smoke. The smoke is an indicator of an inefficient DOC. Soot loading codes would require at least removing the DPF, getting it baked, cleaned and flow tested. If it passes the visual and flow test, reinstall with a new DOC. To cover your bases, you are likely looking at replacing both the DOC and DPF with that mileage.