My car developed a problem with the serpentine belt and tensioner pulley. The dealer informed me that the repair would not be covered under warranty. The warranty company regards these parts as "wear" items.
I called NAC to verify the dealer's claim. The NAC representative explained to me the serpentine belt is definitely not covered under the warranty. He then proceeded to tell me that the tensioner pulley was not listed as either "covered" or "not covered" and company policy is to deny any warranty claim for a part that is not specifically called out on the "covered" list.
As an example, if the oil-pump gear's set screw is not listed under the "covered" section and falls out, causing the engine to lose oil pressure and destroy itself, they would not be under obligation to fix it. How convenient for the warranty company.
The quoted cost for the repair is not unreasonable, and I can easily pay for it. My issue lies in principle: I paid for warranty coverage for my car through the dealer at the time of sale and adhered to my end of the contract. I would expect the warranty company to hold up their end of the agreement and cover all "reasonable" aspects of the car needed to maintain proper operation during the warranty period.