Cutting System Blocked?

415x has been almost flawless for 3 years now and all of the sudden the last couple of days it has been unable to start a mow with the warning cutting system blocked. There is nothing blocking it and it spins freely. I'll reset the error and try again and usually can get it going again. But eventually I'll get error again. I will say its started having an abnormal kind of droning noise when spinning lately that I haven't noticed before. Possibly the motor is wearing out? What's the expectation on repairs for these things?