Start Device WPW10197426

My refrigerator and freezer stopped cooling and freezing. A repair technician found corrosion on the connector pins to the refrigerator evaporator fan. He removed the connector and spliced the wires. He told me to leave the refrigerator on for 24 hours to allow it to return to normal operation, which it never did. As a retired electronics tech, I decided to research the problem on your website. I began with the first suggestion to replace the compressor motor start capacitor. I removed it according to your video. It is rated at 12uf. I measured it as 12.1uf when I tested it. Since it tested good, I moved to the next part, the bi-metal thermostat mounted on the freezer evaporator assembly. A paragraph on the website said a resistance test would reveal if it was good. Although the suggested test for warm and cold resistance seemed more appropriate for a thermistor, I performed it and found that it did not display the suggested resistance. I replaced it without achieving any benefit. I have observed that the freezer evaporator fan is not operating. I checked the voltage at the fan connector. It measures 120vac. I removed the fan from the refrigerator and connected to a 120vac power supply. It began operating. At this point, everything on the refrigerator appears to be functional except the compressor. Must the compressor be operating properly before the evaporator fan will operate? Should I replace the compressor start relay, part no. Wpw10197426, on which the start capacitor is mounted or do you think I am on the wrong track?