Refrigerator Samsung not cooling at all Repair in San Jose, California

Refrigerator Samsung side-by-side – stopped cooling at all Repair. Then I check pressure in low side – pressure gauges showed -20 PSI of pressure. That means that it’s definitely freon leak because compressor pumping and making vacuum. Than I did try to charge little bit refrigerant and evaporator coil started freezing. And in that moment I noticed whistle noise from fresh food side and found freon leak. After brazing works and recharging refrigerant R134a with weights refrigerator Samsung started working perfect.