Edit: so after studying more up on three manner switches i may think i know how they originally wired it although, i simply haven't seen any diagrams accomplished this manner. It seems like they passed the 2 traveler strains thru the primary light after which to the second one switch then the electricity could be coming from the second switch to the opposite lighting. Not positive if that is accurate however perhaps someone can shed a few mild on it as i have never visible it carried out like this. What i have is a mild transfer at the top of the steps that has electricity getting into it. From that transfer it then has a 3 wire jogging as much as a mild above the transfer, which has never worked given that i purchased the residence.