Good old Freon (R-12). Some units were converted buy there should be a sticker near the compressor if they have changed it over to the 'cheaper' stuff.
Although it is expensive and hard to find, a recharge with Freon is probably your best bet. I had a pinhole leak in the refrigerant line of one of my basement airs and Newell soldered the leaking area, pulled a vacuum on the system and recharged it with Freon.
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