Took my 2004 Mercedes E55 AMG in to the shop last week as the battery/alternator light was coming on and off. Was told that it was in fact a defective alternator. Since I had just replaced the alternator thirty days before with another Mercedes mechanic, I asked Mercedes of Arrowhead to put my car back together as I intended to take it back to the other mechanic for full warrantied replacement. After car was towed to original mechanic, was told that Mercedes of Arrowhead not only attached the alternator incorrectly, but also cracked my radiator while doing so! Definitely will not be going back to Mercedes of Arrowhead for any future services!!