[CuTHAN]

PLEASE HELP !!!!! I have a GE refrigerator for around 4 years. It is a Side by Side model. Suddenly my freezer is not freeze and my fridge is semi cool. I still hear my fan running constantly, lights on both sides is still working. The door switch is still working properly. Please help !!!!

[woodchuck]

If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air .
check defrost timer, defrost heater, defrost thermostat.

Refrigerator Repair Guide: How To Fix a Refrigerator - ACME HOW TO.com

In most of the new units they now have the evaporative defrost control instead of defrost timer, It senses when to defrost based on how many times and for how long the door is opened. It's more energy efficient but there does seem to be lots of problems with the board.
Part 801 in this diagram of your model.

GSS25PGMF Parts List