Whirlpool ED5LVAXWB02 The freezer is cold but refrigerator is warm. I checked evaporator coils and they have no ice on them. The temperature in the refrigerator is about 42F

Refrigerator & Freezer Repair
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Whirlpool side by side ED5LVAXWB02
The freezer is cold but the refrigerator is warm. I checked evaporator coils and they have no ice on them. The temperature in the refrigerator is about 42F. I put a meat thermometer in the difuser vent in upper left of refrigerator when compressor and fan are on and it reads less then 0F. The fan is blowing air in the freezer and keeping food frozen. I think the door in the difuser is bad. There is very little air flow thru the vent. Is the part number for it WPW10151375 correct? Is this the part that needs replaced.
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The air diffuser/damper is part number: Diffuser-assy-WPW10151375 - [AP6015810]
Link to the part: Whirlpool WPW10151375 Diffuser (AP6015810) - AppliancePartsPros.com
Link to additional refrigerator troubleshooting: Refrigerator: Troubleshooting Common Refrigerator Problems & Solutions