you pay what? for them to look at it? that sounds like some serious BS to be honest...if you change to after market and you see they are still defective you are responsible for any thing there after..for better performance change em
when I have an issue and send the car over to toyota, i tell them the issue and the research it free of charge..
just over a month and a half ago, my corolla's brakes were squeaking and it was due to sort of dust getting into the rotors..ended up having both my front rotors re surfaced..
now again I am going thru the same issue and toyota cannot replicate the issue..mind you my car is at 7k miles and my brakes were resurfaced at 6k miles..