Disclaimer and context:
This process was observed during a single case of a power brownout (power was at 55v for several hours). While in the end, this was the fix for this case, every situation, especially those where data loss is a direct risk, must be carefully considered. Contacting support first in this situation is always recommended however if confident you can follow the below quite simple solution.
Boot into MegaRAID WebBIOS during reboot using Ctrl+h, and change all "Unconfigured bad" drives to good. Save the configuration.