warm frig good freezer, icemaker stopped, & water leaking

3 months ago our we found our 6 y/o Kenmore side by side refrigerator warm - freezer fine. We realized we had food covering the airflow in the frig.
We defrosted, shifted food, cleaned coils and it cooled again but in the process the icemaker quit working…we’re using ice trays now.
Meanwhile, the same "frig not cooling" problem is recurring every 3 weeks or so even with keeping the cooling vents uncovered. The freezer seems to be working fine but gets slightly icy just before frig goes warm. After researching online, it sounds like it may be the bithermal thermostat and/or diffuser? Your thoughts?
We turned it off 9 days agao and have been researching to fix it ourselves.
Since we are going to order these parts, would like to troubleshoot icemaker too since they seem linked as icemaker was fine until first warming.
In addition, we quit using the water dispenser 2 years ago as it would just leak constantly after use…assumed it was hardwater? But again, seeing online that is a common problem?

Please help us with:
[LIST]
*]repair of warm frig
*]not working icemaker
*]leaking water[/LIST]All in our just 6 y/o refrig…so sad. It would be great to have it all working well again. We do have a large family and keep the frig/freezer quite stocked…now we know to keep those vents uncovered though. We are on day 9 without a refrig in the kitchen…thank goodness for the OLD, smaller garage frig kept for parties. Any specific helpful advice is so appreciated.
Thanks much!