I'm guessing those wouldn't display to the driver most likely, they'll need to run a diagnostic. I don't have the equipment to check the codes myself. I think to
@Fightnfire 's comment above, this is my only vehicle and I'll have an 1100 mile journey back to Colorado. Plus since I'm often overlanding it some happens out there then what? Will Toyota or the dealership in Wausau pay for the super expensive trail recover too? If the problem is big enough it can cause the truck to fail, I'd much rather know they replaced the parts with parts they know are not defective than hope mine isn't.
On the flip side, doesn't Toyota pay for the parts and labor anyway? If so, why wouldn't any dealer not want to take that on?