Seeking your assistance pls. i reside in South Africa and my Mark Levinson AMP on my Lexus LS 460 - 2007 model has blown. The Audio repair company appointed by Lexus cannot work on the Mark Levinson because they do not have the 'jigs' to test the equipment because Lexus is not a high volume brand here and the cost of the ' jig' is too high. My question is: From your experience what usually goes wrong with the amp ? Can I trust a Car Audio Repair shop to look into the AMP and do some diagnoses without the ' jig ' ? - Thank you for your assistance - Regards - Louis