Help please, I first noticed the problem when the frige was not putting out ice very fast. I started troubleshooting and don't know what to do now. The freezer temp would hold at 27 and the frige is 50. I took the back panel out of the freezer section and the bottom part of the coils was iced over, I melted the ice with a hair dryer and it started icing up right away again. I then vacuumed behind and under the frige, it was not very dusty. All the fans seem to be running and the compressor is warm/hot and the condenser fan is running. I looked at the motherboard and it appears fine. I have no idea what to try next.

Thanks