Hello, our 2014 Diesel coach went to a local dealership for warranty work on the tankless heater. Short of the long story we then received a phone call telling us that we had a major propane leak in a line that they could not find. Star warranty is only covering a fraction of the cost to replace about 7 feet of copper tubing. The dealership is charging me the remaining balance. Wouldn't a break in a copper pipe be a defect in the product?