Thanks to the new tuning suite, I've been able to resurrect 2 of my 4 dead dies... for a couple minutes at a time before they die again. One of them actually works better when I lower the die's voltage to the minimum -0.1465v. The bigger problem, however, is that even when the previously dead dies are online and hashing, I don't believe they're producing usable shares. My hardware errors spike and, more importantly, my WU (work utility) does not increase (stays around 10k for 6 modules with 20-22 working dies out of 24).

I guess I'm still going to have to RMA my newly purchased modules :-(