I called for service on my Samsung refrigerator/freezer that was not cooling properly in the refrigerator section. The technician only put a thermometer in the freezer section for about 10 minutes. He said the coil was freezing up which only happens when the coolant is low. He then proceeded to tell me he could not repair it. He indicated the life of the unit was only 8 years.
After some discussion he did tell me I could get some coolant added and it may last a while but that he could not do it because he would have to warranty it for 90 days and it may not last that long. He suggested that I have someone add a little coolant. He did seem to be in a hurry to get out because of the holiday coming up.
I had someone else look at the unit and he informed me it did not need coolant. He indicated it was probably a minor part and the defrost cycle was malfunctioning. I ordered the 2 parts he suggested we try first.
In the meantime, we had a severe windstorm here and our power was off for 5-6 hours and the refrigerator worked fine for about a week then froze up again. My son and I viewed a video on how to repair it and we decided to try it. It took about an hour including defrosting the coil. It has been 2 weeks and it is still working fine.