10 or 11 years is pretty young for a diesel truck. If it’s in good shape otherwise, I’m usually in the fix it camp.
Sounds like you’ve researched the issue in-depth. In case you hadn’t come across this post, guy states he replaced the NOx sensors, reset the codes, and eventually the poor def message went away (posts 1-16). Might be worth a try, esp if you have or can find a reliable indy truck shop near you.
https://www.duramaxforum.com/threads...reset.1011050/
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2021 3231CK, Legacy - dual panes, Kodiak 250 discs, slide awnings, iN-Command, TST-507, 206 Ah SOK LiPo, AC soft start on rear, Starlink RV
2021 F350 SRW CC, 6.7, LB, 4360 pyld, 2800 lb rear SumoSprings, spray on bedliner, 19K Demco Recon on factory pucks, CA non-commercial Class A
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