I want to run 3 (or maybe more) ceiling light fixtures in a middle-of-the-run configuration between two 3-way switches and I can't find a wiring diagram anywhere that shows this. I thought this was a fairly simple and common install; power comes in through my 12-2 wire, through my first 3-way, down the hallway with 12-3 wire through three lights, and ends at my last 3-way switch. I know how to wire a single fixture, but where do I run the neutral for the other fixtures if I'm re-coding the neutral for hot after the first fixture? Do I actually have to run another wire (making it 12-4)? I know I shouldn't wire them in series, so what now? Thanks for any help!

For reasons related to the potential combination of water and electricity, and with full knowledge of the potential for nuisance tripping becuase of the motors, several years ago I replaced the standard outlet (grounded) that my washer and dryer plug into with a GFCI. For years, it was fine. Recently, however, the GFCI has been tripping when the washer hits a certain point during its cycle (always the same point). Thoughts on what this could be?