Anyone know what may be causing an issue where neck works, bridge works, but zero sound in the middle position. Bad switch? Improper wiring? I mean there just can't be that many reasons for this issue but I've been working on this 3 hours now and nothing. ANY help is appreciated. Can we please start with simply telling me all the ways that this problem could even happen?? I work better when I understand the why before I try the how. Thanks!