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Freezer ok, refrig compartment warm and refrigeration system cooling can be diagnosed by removing freezer compartment back cover. If coil iced up it is not defrosting properly.
First, melt off coil with hot air gun. Then check defrost heater, fuse and sensors.
At upper right where pipes to coil enter compartment there are connectors for defrost heater and Sensor & fuse assembly “combo.” Looking at online picture of combo may help. See: defrost sensor Part# 6615JB2005C.
First unplug electric defrost heater element connector. Check heater resistance with ohm meter, OK if between 30 to 100 ohms, plug back in. If open or shorted replace defrost heater.
Next to heater connector is another with 4 wires from sensor & fuse in clear plastic packet attached with cable-tie refrigerant coil.
Unplug the connector and check resistance between pins to fuse. It should be less than 1 ohm. If fuse is "open" replace whole combo assembly. For a temporary fix, cut fuse wires from the packet and wire them in series a 10 amp fuse/holder. For long term fire safety a “thermal”, not “current” activated fuse must be used.
Did not have spec's for sensor resistance but mine was 12,000 ohms at room temperature. Sensors have a wide range of values based on technology and temp so there is no rule of thumb. Open or closed resistance is usually bad. Get actual spec to verify'
While there are many reasons for "Freezer ok, refrig warn" these are some easy things to check out
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