After checking the bulbs to no avail I decided to order and install a new switch. The switch was cross referenced with the original part for this 20 + year old refrigerator and was correct. An easy fix. Made sure the power was off and removed the 5 screws holding the face plate and control panel in place. Unplugged and removed the old switch, snapped the new one in place and reconnected the wires. Put the face plate and control panel back in place and turned the power back on. Everything works fine. 10 - 15 minutes!