I dont think this is stepping on anyone's toes since Corey seems to be out of the game right now.
When I corrupted my SD card he sent me this email with links for the 5BC.
Its a pretty easy process to reformat the SD card with the image below using the instructions also below.
I definitely recommend buying an extra SD card and format a backup to keep when it happens again and you are ready to brew.
Here is the image file download:
https://drive.google.com/file/d/0B3v5TJRshLI0X1dpTUJGazV0V2c/view?usp=drivesdk
How to install images:
Raspberry Pi Documentation - Getting Started
To open the unit:
remove 2 bottom screws on the front and the 4 screws on the back, loosen the 2 cord grips. Move the back panel out of the way and the whole bottom will slide off towards the back.
This video shows how to finish configuring elsinore