Both the Flatbush and Marine Park eruvim are checked weekly. An announcement goes out before each Shabbos as to whether they are operational that Shabbos. For questions about the Flatbush eruv you can contact Rabbi Auman, and for questions about the Marine Park eruv, contact the rav of Merkaz Yisroel Marine Park Jewish Center.
If you do not choose to hold by these eruvim, that is your choice. However, you do not have the right to tell anyone else which Rav to hold by. If my Rav, to whom I turn to for all my sheilos, says the eruv is kosher, then that is how I hold. Its not YOUR decision to make for me. It’s between me, my Rav and Hashem.