I started a couple years ago when I built the new fuse panel. This year I'm replacing some of the original Perko light fixtures that are slowly crapping out with new LED units. All the original wiring is a very coarse, stranded, untinned copper which has become blackened over the years. I've probably ripped out and replaced another couple hundred plus feet of duplex wire this spring. There are a few runs through the headliner and buried in bulkheads that I'll probably never be able to pull and replace.