"Loop the area around that peak, then one by one, mute individual tracks until you find the one that contributes the most amount of signal. For example, suppose a section peaks at 0dB. You mute one track, and the peak goes to 2. You mute another track, and the section peaks at 1. You now mute a track and the peak hits 7. Found it! That's the track that's putting out the most amount of energy."
Um, no. If you were soloing them, then yes. Unless you meant -2 for the first one, -1 for the second, and -7 for the third.