Hello all, newbie here. I own a Frigidaire side by side GLHS268ZD refrigerator. My problem is that the freezer is reading around 50 degrees near the top but will keep ice frozen at the bottom. The fridge side is warm at the top but will keep butter hard or can drinks cool at the bottom. We are very very tight on money so am taking this on myself if possible. I fix my cars and can read a meter if that will help me. If anybody knows what this might be, your help will be greatly appreciated.