Hi,
Here’s the [https://www.partselect.com/Models/WSF26C2EXF01/Symptoms/Fridge-and-Freezer-are-too-warm/|most common problem parts] for the symptoms you’re describing, taken from this [https://www.partselect.com/Models/WSF26C2EXF01/|website]
The supplier was only shown as an example to give an idea of the cost of the parts most likely to be the problem.
There are other suppliers that may suit you better if you go to order parts.
Just search for ''WSF26C2EXF01 parts'' to get results.
Also found this link to the [https://www.servicemanuals.net/WHIRLPOOL/WSF26C2EXF01--WIRING-DIAGRAM-TECH-SHEETS-AND-EXPLODED-VIEEW-PARTS-LISTS/1601538/detail.aspx|service manual] if you wish to '''''purchase''''' it. I don’t know what it contains but wiring diagrams and tech sheets are usually very helpful