I'm just now learning about Eruvim and all their complexity. What kind of things can invalidate an Eruv, or are required for an Eruv's validity? This question is inspired by this comment,
for this kind of thing you need to talk to an Orthodox rabbi — lay out the whole situation and have him explain the best/easiest/least expensive way to do this. If you take action on your own, you risk invalidating the existing eruv. An Orthodox Jew would have go through exactly the same procedure, it's called "asking a shayla" (Hebrew [yiddish] for question)/ "getting psak" (rabinnical advice) – יהושע ק
I would just like to be more informed on this topic.