Fridge is getting warmer over time. Freezer still making ice, but defrost is not working too well

Refrigerator & Freezer Repair
1

Brand: Whirlpool
Model Number: ET21DKXDW01, mfg. date 1995
Main Symptom: Fridge is getting warmer over time. Freezer still making ice, but defrost is not working too well
What happens & when: The fridge has been gradually getting warmer over the last 1-2 weeks

Error Code (if any): none, but a motor seems to be running, the coils are underneath the fridge, and they are not covered in frost
Parts or tests already tried: none yet
Photos / video link:

2

You will need to check and see if the compressor, condenser fan and evaporator fans are running. Check the coils underneath for dust and debris, and check the evaporator coils (inside behind the back wall of the freezer for frost up, or iced up conditions.

[AppliancePartsPros.com]
(Refrigerator: Troubleshooting Common Refrigerator Problems & Solutions)
https://www.appliancepartspros.com/repair-help/