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If you are talking about the sconce type lamp with two bulbs and a push-button switch .... remove the fixture from the wall and check for power. (12v dc) I had to replace that switch on my '07. I used an automotive toggle switch. Your fuse panel SHOULD have small red led lights to indicate a blown fuse. Accent on should on an '08 trailer and is not a sure thing but a place to start. Lack of power to slide motor would be another problem and since it is now working it may be an auto-reset breaker that was stuck in the open position.

Oh, and since you have a replacement for the fuse on the frame, replace it and as mentioned clean up and put new terminal ends on the wires. Smear (technical term) some di-lectric grease on it so you don't get the rust and corrosion like on the old one.