Greetings!

I'm seeking advice regarding my Frigidaire FGHS2631PF2 that will not defrost.

When first discovered (last month), I tested the defrost heater (which continuity tested @ 35 ohms), and the defrost thermostat (which tested at 1.2 ohms, cold) ...

I replaced the control board after seeing these results (the fridge does not have an independent defrost timer).

Low and behold, 2 weeks later, I'm frosted up again. The components still test in the same ranges. Is it possible that I got a defective control board? Or is there another part or thing I should test or check? Am I correct in assuming the other components are good based on meter readings mentioned?

Thanks for any and all help!