Unencrypting a disk after crash

Question

My main boot drive is encrypted.  I back the drive up nightly to another internal drive.  Yesterday morning, my main drive suffered a corruption to the master boot record and could not be repaired in software.  As a result, I booted from the backup drive and wiped the master drive using disk utility.  Before wiping it, it asked me for the encryption password, which I did with no difficulty.  After wiping the drive, I then used SuperDuper to take my backup drive (my current boot drive) and clone it back to the master drive.  Before doing this, I ran every disk diagnostic I could find to make sure that this wasn't an issue with the physical drive itself.  Every test showed the disk performing as expected.
After restoring the main boot drive, I changed the startup disk back to the original boot drive, shut the machine down, and then a few minutes later rebooted into the newly restored boot drive.  The first question I was hit with is "Boot password".  OK.  Got that.  Then it went into the boot screen from which I was able to start.  I decided that I would remove the encryption until I was certain that there was nothing wrong with the drive physically.  I discovered that I can't remove the encryption because the copy itself wasn't encrypted and therefore DiskUtility sees me as not having the privileges to unencrypt the disk.  I doubt there is a simple solution to this problem, but does anyone know a method that would assist in removing the total disk encryption of FileVault without having to completely reinstall all the software from scratch?
I've searched and what little I've found doesn't seem to apply.
Thanks.

Answer 1

Unmount all volumes except the one in question.
Triple-click anywhere in the line below on this page to select it:
{ diskutil list; echo; diskutil cs list; } | open -f -a TextEdit
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
A TextEdit window will open with the output of the command. If the command produced no output, the window will be empty. Post the contents of the TextEdit window (not the Terminal window), if any — the text, please, not a screenshot. The title of the window doesn't matter, and you don't need to post that.