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Yes it can be fixed.
There is a tiny light bulb inside the radio. You need to know how to get the radio out in order to get at the bulb. If the radio has a skin over it, remove the skin. In any event, the face of the radio will probably have four holes, one in each corner of the radio face.
You need to push something into each of these holes in order to disengage keepers and pull the radio out. I've successfully used the shank end of drills in the past. Any straight wire/rod that is slightly smaller than the diameter of the hole will work. Make sure that the leading end of the wire/rod is chamferred or radiused so it doesn't have a sharp edge. Look in your yellow pages for "Radio Repair". They normally stock these light bulbs.