Kitchen Aid KSRB25FNSS00 top shelf warmer?

Refrigerator & Freezer Repair
1

Brand: kitchen aid
Model Number: KSRB25FNSS00 Fridge
Main Symptom: top shelf warmer
What happens & when: top shelves is 50 degrees in the fridge, next lower shelf is 45, next lower 35 and bottom two drawers are 30 degrees. The freezer is a stable 0 degrees.

what part needs to be replaced to ensure the temp. in fridge is even through-out

2

Based on your description the issue is likely a damper or damper thermistor. If these are not the issue check air flow from the evaporator fan.
https://www.appliancepartspros.com/whirlpool-thermistor-wp2188819-ap6006067.html
https://www.appliancepartspros.com/whirlpool-air-diffuser-assy-wp2216112-ap6006658.html