GE Refrigerator Criper Freezing and frost build up

Hi,

I looked through other posts and could not find one that exactly matches my problem. This fridge is about 4.5 years old, some 4 months back we noticed that the vegetables in the crispser section (second tray from the bottom) started freezing. Also noticed that top rack was slightly warmer than the bottom.

Also, 2 months back we started seeing frost build up in the freezer section. Thats when i called a repairman to check the fridge out.

He mentioned that 2 temperature sensors have to be changed. Again he spoke to some one on the phone and they concluded the control board also needs to be changed.

At this point, i have ordered the control board from appliancepartspros, and plan to replace it. However i would like to get a second opinion before i start the work.

Cricfreak