Does anyone know how to do this on a RF23HSESBSR. When I hold down Freezer + Lighting it goes to a defrost menu with the options of: FF OF rd Fd. I know rd and Fd are defrosts. I'm not sure what FF and OF are though. I think my refrigerator would be perfect if I could adjust this offset. I found it for similar refrigerators, but not sure how to do it with mine.