Remove the light so it's not getting low voltage. Every time I've seen this issue it's always been the light switch. You can check the voltage at the board. J11 (brown) goes to both light switches and the RC light is working. Measure the voltage from the brown wire on the light switch to Neutral (orange) from supply voltage. Then measure from the red wire on the switch and see if it's the same.
OK will try it.. By board, do you mean the control board of refr.? Did buy a new switch both old and new bench tested same. yes, the reg . compartment light is working.. I will remove the LED light from freezer..