Yah, I can definitely see the owners point there, however it could be worse, could be like a company that will remain nameless and tell the customer for warranty work the stove needs drained, shipped back to the factory and the owner gets to pay freight both ways.
Not sure why I was even there, but was on Legal Zoom awhile back, they have pages and pages of stuff for warranties.
Personally, and this is personally, installing a new air box wouldn’t bother me that much. I’ve yet to make it to the ranks of a rich farmer yet, had all kinds of issues with the last used combine we bought, paid 140K for it, but the dealer was in no hurry to help out much with problems that arose mainly as he was keeping the new ones running that guys dropped 300K or better on, he flat out said, if you wanted a warranty you should have bought new.
That’s why none of my equipment will ever have a DEF system on em, I like old school far as equipment goes, roll it down the hill if required when the battery is dead or the starter is out. Newest one we have if the alternator is one it’s last legs but still not turning the idiot light on the three point won’t work and sometimes it won’t shift gears. Fought that for weeks once until actually testing the alternator while on the tractor.
I’ve had injection pumps apart before with some success, have yet been able to take most sensors apart and repair em.