[jcurtis934]

Would have thought that someone with a 3400rl would have jumped on this post by now. I don't have that model, but I would suspect that it is an issue with the 12 vdc source that feeds those...either a loose wire on the back of the converter for that fuse OR if there is a junction box under the living room slide that may have been used by the factory to run power wiring. I would check the fuse with a meter to make sure that 12 vdc is present on both sides of the fuse WHEN the lights aren't working. That would tell me that there is a wiring issue, either at the converter or near the slide (junction box). Hope this helps in some way. John