Maybe you can find an engineer on YouTube or Patreon that does appliance teardowns.
For refrigerators (looking at you GE), they build up dust, and the airflow fan dies because of built up dust. And try getting a replacement if you aren't a GE Certified repair person. Even GE referrals often suck and cannot do the job. Took three repair visits to get a fan replaced.
If anyone has some solid refrigerator suggestions, I'd love to hear them. Preferably with water and ice in-door .