First welcome to the forum.
Some more information please. I assume that your trailer is a FUZION 369 ??? What year trailer is it? Is this a "new problem" or have the lights "never worked"? Is the trailer in warranty? Do you have any extended warranty or maintenance/repair program on the trailer? Have you done any troubleshooting other than checking the fuse ? Are there any other electrical issues? Are the lights controlled by InCommand as well as separate switches? Some were wired that way, some weren't....