I need a relay for a freezer that is 50+ years old. The number is WR7X8, not sure if I can still find this part, but the freezer no longer shuts off. I hear the thermostat switch click when I go from low temp to hi, but freezer never shuts down. I tap the relay can, and the unit then shuts off, but once it turns on again, never shuts off. This thing has been a real workhorse and now a family member after all these years, would like to fix it. Is there a part I can still get to do this?