Imo, they kinda don’t just “break”
If you take them apart get em all greased up, even if a motor burns up, it’ll still work pretty easy manually.
Being super prepared, maybe try to source a used working motor/head.
But $3500 for something not broke, especially if you don’t have cause to think failure is impending, is not well spent.
Although your stated plans to keep it for a long time may make it more worth it.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold