I'm not sure about faulty wiring, but i think "trauma" is the wrong way to look at it too.

My relationship with one parent definitely impacted my attachment style. It wasn't "traumatic" though, i.e. I was not abandoned, neglected, physically abused. Its actually been interesting to realize that some of my "wiring" was very heavily mirrored after the same wiring in my parent. I definitely was "nurtured" into some problematic thought processes, not malevolently, but through modeled behavior.

I have also read that different people and relationships can bring out different attachment styles in you. Im not sure what to make of that, except to think (hope!) that if I can build a strong foundation of thought processes + behavior, I will hopefully be able to return to that as my baseline. If that makes sense?