How to use Disk Utility on a drive that uses file vault 2 for encription
I was able to successfully repair my OWC SSD in my MacBook Pro early 2011 by removing the file vault encryption using the Security & Privacy control panel, then running Disk Utility from the recovery partition. Without removing encryption, the "Macintosh HD" was not selectable in Disk Utility from the recovery partition. After removing encryption, it was available. After repair I turned file vault on again and everything was fine.
I had corrupted my disk by emptying the trash which had 38 GB of duplicate Aperture data. The finder froze while emptying the trash and left a whole lot wrong with the disk.
I hope my success helps someone.