Hello James; It sounds like you have a couple of problems. One with the defrost circuit which is made up of the defrost heater, defrost thermostat and the defrost timer. Since it is a Roper it could be any of these items. You can check the heater and thermostat with a multimeter and if you have no resistance on on the heater it is good, the thermostat will have a very low resistance (28 ohms is normal), and it both are good then it is the timer. Now for the main problem, since you say the fan is operational and the cooling tubes are open then I would suggest you run a wire (14 gauge or guitar string) down the drain on the refrigerator side and clear the blockage. I know this doesn't make much sense, but although the fan is pushing air out of the freezer into the refrigerator section (at least somewhat) it has to have air ciculation so either your drain is blocked or the lower cooling tube is blocked preventing a complete circulation path. BTW if you have had cooling tube blockages in the past you can use a strand of wire (14 gauge) hooked over the defrost heater and down the top cooling tube to keep frost from building up.
If you do NOT feel airflow (with the evaporator fan operating) when you open the doof to the refrigerator, my original answer is good. But if you feel a good air flow, then it could be the refrigerator thermostat not telling the fan to kick on when it should.
You should also check to make sure that the condenser coils are not gunked up so that the unit doesn't have to work hard to reach temperature.
James; sorry about the choppy answers to the problem, they just switched to a new site and we are still getting used to the changes. I had put in the part numbers for the defrost heater: 2315530; the defrost thermostat: 4387503 and the defrost timer: 482493 but it didn't make it into my original post
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