This fridge has had a problem of ice building up around evaporator coil in fresh food side. Wife (she HATES this thing) says it's done this from day one; 10 years. GE guy says all these models do this and there's no fix for it, so we have clean out the ice periodically... Like the 1940s pre auto defrost.
Now with the issue of FF side temp too highi assumed the ice had built up around FF evaporator coil preventing proper cooling, but AppliancePartsPros.com suggested the FF temp thermistor may be at fault. It's cheap and their video showed a super easy repair, so I decided to give that a try vs buying a new $2500 fridge to satisfy wife.
After removing the thermistor I flung ice build up in the fridge wall cavity holding the thermistor. Thinking that since the ice is 32 degrees, it's close proximity to the temperature sensor would make the control system think the FF side was way colder than it really is; 37 vs 43 actual. I removed the ice and filled the cavity with some packing foam to hopefully prevent ice build up in that area and reinstalled the old thermistor.
Fridge is working "ok" now; 3 degree difference in display vs actual. I turned the temp setting down to 34 the get FF side to 37, but wife doesn't understand that...just happy fridge feels cold to her. When she's not around for an hour or so I think I'll put in the new thermistor in effort to match the display to actual temp since it's super easy to do.
Thanks Appliance Parts Pros for some super customer service. I'm a customer for life.