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Steve,
With a leak that big it should be obvious where it's coming from. My system is 25 years old. A system doesn't miraculously develop leaks unless there are factors like sulfur that causes corrosion or an object piercing the outdoor coil like a stone from a lawnmower. A common leak point that gets overlooked is the schrader valve. I had one leak like a sieve on my parent's system. BTW their system is almost 30 years old too. It's not the age, it's the tech not looking for the cause of the leak.
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Nick
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