If it has a leak, charging the system with more refrigerant is only going to be a temporary fix. It won't be long before that refrigerant leaks out, too. Sometimes it's possible to repair a leak by soldering over it, but condensor coils can be very hard to get a clear shot at, and if they're rusted over, it probably wouldn't be worth it anyway.
I'm a universal refrigerant tech, and I'll tell you that five years is not really an exceptional time for a unit to develop a leak. In fact, before we send units out we pressure test them at the shop because about half of them come from the factory with leaks.
It looks like a new condensor coil is in your future. Be happy that's all you have to replace.
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