Dusty, your wording is not clear when you wrote “ I have mean” ...but if you only made a typo and intended “meant”.... Then it’s understandable.
However, what you describe is not a Kubota action but an owner action...and THAT is not Kubotas responsibility.
Your next suggestion that an “attorney send them a letter” ... sounds a lot like getting a ”note from Mother”. I don’t know why it’s so popular to think a letter from an attorney is a good idea.... UNLESS it’s the owners desire to make this an expensive propostition even in the absence of a problem.
If a Kubota-representative dealer works on a tractor still under warranty, then Kubota AND the dealer is responsible for their actions.
If it were mine, I’d do as Justasquid implies and get a written description of the repair on the Kubota dealers’ letterhead or invoice or other documentation the repair was accomplished.
It is a separate matter as to HOW the repair was accomplished.... and IF that repair SATISFIES the owner. Personally, I‘d be satisfied if I received the documentation of the repair.
However, the wife and any beneficiary of the owners life-insurance policy might prefer to see a new housing installed rather than helicoils or the longer, correct bolt only.
Why? Because a dealer-mechanic that will strip out threads by not following instructions and by installing the wrong bolts... can make an even BIGGER mess when replacing a housing. This entire situation can be a never-ending circle-of-distrust over what is probably a “nothing” issue. There’s no reason to lose a lot of sleep over this. Get the repair invoice/document and enjoy the tractor. IMO