I looked at the parts website today, and couldn't find it. BTW, my mower is at the dealer, waiting on the part. I understand their point of view, but from my perspective, it's an unnecessary PITA. To draw a parallel, if my car's wiper blades were covered by warranty, why would it be OK to have to take my car to the dealership and drop it off for a week, and then have to pay the dealer's labor rates to replace the blades? Having a threshold for commonly or easily replaceable parts would go a long ways toward building good will. I will legitimately have 5+ hours of billable time lost by the time this exercise in bureaucracy is over. Come to think of it, even the car dealership analogy is shaky, because I can't just drive my mower to work one day and swing by the dealership on my way home and have my wife meet me there and take me home. I'd even be more OK with it if it cost me a couple of Saturday mornings to handle it, but that's not an option...they are closed on weekends.
The counter girl I worked with at the dealership said that they don't see many keypad failures, but the parking brake switch is a common failure, and she constantly fields similar protests.