Just talked with Cadillac Dealer and they say that the fix for "SERVICE REAR AXLE" is not covered under warranty. Wondering why that would be, as that this is a known issue with the drive train?? What kind of warranty does Cadillac issue?? This is an issue with the drive train, so why isn't it covered?? The first Cadillac we've ever owned and if this is the way they treat their customers, it will be the last.