fixing a Frigidaire standalone refrigerator fpru19f8rfc that leaked

This fridge is so bad they stopped making it. Seems like no one on the internet has found the leak. I could not either. I think its just a slow leak and adding port to fill it was good enough to get it going. Frigidaire Electrolux fpru19f8rfc
this valve was worth it BPV31 SUPCO Bullet Piercing Valve for 1/4", 5/16" and 3/8" Tubing 3 in 1 Access
built in refrigerator
freon filling port

[@briansokoloski776]

Are the pipes made from steel or copper I have a Harvest Gold Westinghouse all fridge 40 Years old and still working never needed any Reapirs other than lubrication of Inside Fan

[@sweetpigfarm3645]

Copper

[@cabrina2816]

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