I need to add another switch to a current 3 way switch system. I attached a diagram and hopefully I can explain what I am trying to achieve. The green is the white common wire in the drawing. The faded red is a mistake I couldn't erase. Switch #1 is at the bottom on the stairs. The wire runs up through the wall and is not accessible until it gets to the attic and then subsequently ties into the light. Switch #2 is at the top of the stairs and the wires that go to the light are all behind drywall until it gets to the attic. I have access to the wires right before they tie into the light through the attic floor. How can I tie into this current situation?
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