I used to deal with claims for the biggest aftermarket warranty provider in the uk. Most of these warranties are pretty rubbish but can be excellent, it largely depends on the dealers relationship with the warranty company. A real point of contention used to establish wear and tear or failure is this….sudden mechanical failure, well that’s a claim. gradual deterioration , well that’s not. Unless specifically excluded in your policy as a service item your ok I would say. One minute it worked, the next it didn’t, i.e. sudden mechanical failure….good luck