2 10ish yr old lg multi zone mini splits both low on refrigerant found leak in unit closest to the road could not locate leakage in the other unit. System closest to the road has leaking connections at flare fittings will require disassembly of system to repair leak test and recharge. Ballpark 700-1000$. Second system I sealed valves and time will tell if there are any other leaks in that system. Main section of home has no a/c and will not stay cool with current a/c system...