I feel your pain myself. I've got redundant systems for taking care of heat related issues, but they all relied upon a single temperature probe. It was accidentally removed from my tank recently and the tank spiked to 90F. Even though the heater had its own backup controller, even it failed and 500w of heating was on even at 90 degrees. I lost 75% of all the corals in my tank (which was packed with SPS). So note to all, make sure your probes can't be removed easily (mine now requires scissors to remove).
One benefit, I was fighting a hair algae problem related to forgetting to change out my DI cartridge. Along with the corals, all the nusiance algae in my tank melted before my very eyes (and hasn't returned). Gives a new meaning to "cooking your live rock".
Good luck in getting back up. Nice thing about the club is that there are so many who are willing to share corals. If there is anything you need, I have some very heat resistant corals I can give you.
TimV