Thank you for your question. First, I recommend checking the freezer temperature. If it's not getting cold enough (between 0 & 5 degrees) the fridge section, won't cool properly either. To check the freezer temp, place a thermometer between some packages. Air temperature is
a good check. If this is the case, check to see if the compressor is on all the time or if it's cycling off. If it's running all the time, the problem will probably be in the seal system. If it cycles off, the problem could be with the compressor itself, the thermostat or it could be overheating and a fan kit may need to be installed.
If the freezer temp is ok, check the door to make sure it's making a good seal. Also check the light, to see if it's turning off, when the door is closed. I hope this will help you. If you would like more assistance, reply to this thread and I will be glad to assist you further.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services