This is very strange.
One of my lites is burned out and I am going to take the module out and have a look at it. I don't believe there would be a fuse for these 4 bulbs only and I wonder how many wires are going to these modules.
I would like to see a wiring diagram for the steering wheel that way maybe one could see how this part is wired.
I am going to buy a new module which is very affordable at about $18US before I take things apart than if repairing does not work I can slip in the new one. Just my 2 cents worth.