Frigidaire Side by Side Refrigerator with Electronic Controls 2007

I have a question. Clients refrigerator Fresh Food section light not working and bulb has been changed. I have not headed over yet and taking the light socket and the door switch. Looking at the wiring diagram on page 35 neutral goes to the supple wire goes to "apollo Lighting Control" what is apollo lighting control? it is not on the parts list/digram. where is the neutral wire connected for testing?

THANKS