What is the most logical next event?

How to test a refrigerator ptc relay
Expose the back of the fridge to get access to the motor.
Make sure the appliance is unplugged.
Find the fridge compressor and remove the plastic case that houses the starting circuitry.
Either memorize the wiring or take a few pictures just to be sure you know how to put it all back together when you're done. There's usually a diagram somewhere as well-make sure you can follow it and identify parts.