Trimmed the worst roots, peroxide rinsed, sterilized the rez and refilled it. Every leaf on the plant had shriveled up and died within 48 hours.
I'm glad I turned my attention to back to the clone when I did or else I wouldn't have anything right now. It's a little consolation prize, but I probably won't be trying another hydro grow anytime soon. The coco plant has been TONS easier to maintain and I'm not a heavy smoker, so while a big yield would be nice, I'll be fine with whatever I get.
Still, it's bummed me out to put the effort into that plant and get this close to the end for it to die like that.