What do most people do when their tank develops a freon leak? Fix it or call the tank finished? If you fix it , is their a worry soon after their will be another leak? How much of a pain is it to fix? And how much generally does it cost? Also when do most people stated to get worried about their developing a leak? 30 years? 40 years? Obviously this depends on the type of tank I realize? And what causes the leak? Old age? Corrosion?Any advice is appreciated.