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Hello these systems are all welded tubing, if they need refrigerant, the leak has to be found and welded then the system evacuated using a deep vacuum pump, then the refrigerant replaced.
(this is unlike automobile ac, where there is a shaft seal that leaks slightly and adding refrigerant is an easy process).
Repairs on smaller units can cost more that just buying a new one, Friedrich is close to double the price of most other options .. so depending the size of your unit you could likely buy a new Amana or chinese brand for less than the repair costs.
If you can give me a model number of the Friedrich unit I can look it up and give you a more precise answer.