GE Refrigerator (side by side) - GSL25JFTA Serial #AM254662 Around a week and a half ago i started to notice my refrigerator was no longer keeping things cold so I first tried adjusting the control panel temperature. I adjusted the settings from 6 up to 8 and then 9 without a noticable change. I also noticed the refrigerator is always running now and never seems to reach the proper temperature. The freezer seems to be keeping food frozen. So a week later I decided to vacuum behind the lower freezer area to remove any dust. I also unplugged the unit for 35 minutes while hair drying the inside of the freezer and removing any surface frost on the inner back wall. I did not inspect the coils which I believe is behind the inner rear wall of the freezer. Once this was done i plugged unit back in and listened to it fire back up. Everything sounded normal and I also rechecked the freezer to make sure the fan was kicking on. Might this be a Heater defrost or thermostat? Where are these located if so? Is there schematics available? Part #'s? Anything else I can test or check? Thx!