I basically had to guess based on Google searches of the symptoms and the specific model number. The choices were really limited to the thermistor, the run capacitor and compressor start switch. I went with the two parts that were the most commonly replaced; thermistor 55% of the time and run cap at 25%.
I doubt it was both pieces that failed, but I didn’t want to waste time troubleshooting one part at a time, so I bought both and it solved the problem.
Installation videos did not show my exact model, but there’s not much in there to remove so I figured it out.
This worked out so well that I then purchased the same parts to repair the garage refrigerator, which has turned into a big freezer.