How do I unlock a volume SoftRAID apparently has locked in error? The component disks have no errors
Has SoftRAID locked it, or MacOS? If you got a message this volume is damaged and mounted read only, that means the directory is damaged.
Your choices are:
Restore from Backup
Disk Warrior if you have access to it.
This is not a SoftRAID issue, it is a HFS file system problem.