Samsung freezer not working

:mad: My 1 year old fridge is acting up I need some help! My fridge section is working fine, however my freezer is warm. I do maintenance repair work for a living usually when this happens the freezer ices over and the t-stat is bad. This is not the case with mine. This has went on for 3 weeks and the fridge temps are still perfect. To make matters worse the warrenty repair guy told my wife we have a refrigerant leak!!! I know that’s not true! We love this model and can’t find a new one. I’m mech inclined I just need some help to fix it.!! I removed the panel on the rear and cleaned the coils. And tried the power freeze option with no results. PLEASE HELP!!!

I need help