Refrigerator light not working - none of the "usual" suspects

I have a Frigidaire refrigerator that the light suddenly stopped working on after two years. I tried replacing the bulb and the socket and tested the continuity on the door switch but everything appears to be working. I am not sure if this is a wiring issue and if so what the part I would need to replace/test might be. Any suggestions or assistance with what my next step might be is greatly appreciated.