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You did not say how old the system was, but leaks oftentimes are from nails that punch into or rub against the pipes. Rocks and flying debris that comes out of mowers and weed-whackers, or poor quality install practices using plumbing solder to connect joints or just cheap equipment (builders
In any case if three came out to check and they all said the same thing. Get the whole thing changed. If we are misreading your comment and they meant to say copper pipe perhaps in evaporator or condensing unit, then depending on age of system, quality of system and your budget, will determine just what you need to do.