I have same problem
with the PSS26PStass
with dual coolling system fresh food side frozen ,and read 60-70 degree, freezer fine read 0 or -1.
GE tech Change mainboard , interface and still same problem fresh food side freezing but temp shows 70 degree, freezer fine with 0 degree, now after taking with other tech I thing Refrigerator Thermistor WR55X10025
because it is all iced on top of eveporator, I do not know how to change Refrigerator Thermistor WR55X10025 I found location but harness connect in fresh food side with blue plastic /rubber thing how to snap that? any picture or help to remove ?
please help I can not afford more money to pay to tech this is 3.5 year old refi.