[Richard]

Dave

All refrigeration equipment can be worked on including charging the refrigerant and replacing the compressor. First order of business is to determine if both compressor and fan is
Running for the freezer section. Then see if the unit has access ports for the refrigerant. Only a
Set of gauges attached with unit running will tell you anything. Everything else is guessing.

If you have to install taps to access the refrigerant insist that the tech braze in permanent fittings, the bolt on taps will eventually leak the refrigerant back out.

I made a point about the guessing, I wouldn’t be calling that tech back to my coach. You might look to see if Subzero has a listing of authorized techs close to where you are.

If properly done, breaking into the refrigerant loop is not a fast or cheap process. The temporary tap must be installed, then the refrigerant recovered, then the permanent taps brazed in, then pressurize with N2 to check for leaks, pull vacuum for an hour, and finally weigh in the replacement refrigerant. I went through that to give some insight as to potential cost, and time to do it. It’s a good half day endeavor.