Anyone ever heard of an entire Aquahot replacement? I've had a pestering coolant leak for a couple of months and through trial and error and multiple service visits, appear to have pinpointed the leak to the Aquahot system. Tom Johnson informed me that the leak appears to be coming from the copper coil and there is unfortunately no fix for this other than a full replacement. Estimated cost...$10k+. This is a 2005 coach.

My first question is how does a 4 year old copper hose spring a leak? Second, has anyone ever heard of this type of problem? Does this seem possible? Or am I the unlucky one in a million guy that has this problem?