Does anyone work at a Cadillac dealership and can troubleshoot a bad harmonic balancer? I drop my car at Patrick Cadillac to have them look harmonic balancer and they tell me they can not find the problem while driving the car. I'm not sure where to start her. If you look at it you can see that the outer hub in no longer true to the inner hub. I am concerned as this is a big deal. I have searched online and it seems that this is problem on the Corvette, CTS-V, and G8. I don't want to pay my deductible twice nor do i want to explain the problem to ten people to get it repaired. Any Advice?