Freezer on bottom is cold,refrigerator on top is warm. 2 days before failure there was a vibration noise intermittently between fridge and freezer that stoppped if freezer door was shut hard

This is a little strange to hear but something caused the vibration. Closing the doors hard or soft may make big changes in sound because of pressure change. I just want to know if the compressor is purring away without overheating. Anytime there is a restriction in ventilation the evaporator fan will struggle to push the air to the freezer and enough to refrigerator side to maintain safe temperatures. On the bottom even if the fan stopped the bottom would work because it is below and cold is heavier than warm. I will look over your parts breakdown to see what vent, dampers or fans that may cause this, work with me on this and I will help you solve this. Thanks Sea Breeze