Then it's the freezer door switch that controls the light. Although, modern fridges have electronic control boards designed to make your life miserable. Instead of a simple switch with a wire to a light bulb, you may have an entire computer board controlling it. The boards are _always_ expensive as heck. You can try applianceparts.com for replacement parts for your specific model.

(It was the words "Professional Series" that gave me "pause" regarding the electronic wallet cleansing you may have to deal with. I'm sorry, but I'm an old appliance tech that has lived long enough to see these appliances become unnecessarily too expensive to repair a problem that would otherwise have been an incredibly simple and cheap to repair... and frequently not even need a new part. Technology does no favors for owners regarding appliances. It is a cheap way out for the manufacturers because electronic circuit boards made in China are cheaper than the electro-mechnaical devices they replaced, yet cost many hundreds of dollars to buy a replacement circuit board; which is quite literally a scam designed to make you buy a new appliance).