First thing I would do, if you brought that car to me, is this. It's easy enough to disconnect everything that circuit powers up. Put the fuse back in and turn key on. Should be good. Start connecting things back up until you isolate the problem. Simple enough.
If you recently changed out lenses, and didn't have the issue beforehand, that seems like a logical place to start.
And of course, the obvious. I always do this first whenever I purchase a used car. Check every fuse. Be sure it's the amperage Henry says it should be, and not something smaller. I was just working on something a week ago, where I found someone replaced all the 15a fuses with 30's, lol.
Not good, for obvious reasons.
FTI TW heads/FTI cam/RPMII/A-trim/T5 & 4.10's/QH w/ BE & EA/GUFB