standard CYA, as in this time, and only this time,it's on the company dime; now that your serial number is associated w/ a "modification" I'd guess your warranty has been modified as well.
Disclaimer: this is speculation based on my experiences, some more recent, and I have no axe to grind w/CVA.
Non-MZ content to follow.
I am just old enough to remember when a company satisfied a customer by providing a product which endured and therefore had value. This planned obsolescence strategy, now dialed in amazingly well by the engineering departments in relation to warranty periods, may result in a fatter bottom line on the balance sheet, but I tend and prefer to become attached to my "stuff" and do NOT feel satisfied!! Frankly, I dislike buying anything new at this point and avoid it as much as is practicable.
For example, think about cars/trucks on the road today;in 25 yrs will anyone ever talk about restoring that classic-the 2010 Mustang?!
Rant over, thank you.