I finally got around to fixing the weather feed on my Sony Dash today. Many thanks to those who contributed, especially Duane.
One quick note regarding the instructions to fix the 5-day weather forecast. While I'm computer literate (but rusty) I was not familiar with WinSCP Portable. I Googled, found, and downloaded the software to my Windows PC, then tried to follow the given instructions. However, I was missing a key piece of info where the instructions say "Access the Chumby with WinSCP via SSH".
For the less informed (like me) you will first need to get the IP address (192.168.XX.XX) of the Sony Dash, which is on the Menu-Settings-Network page. This is what you enter into the Host Name field after starting up WinSCP.com. Also, as mentioned, enter "root" as the User Name with no Password. This will give you access to the Sony Dash files so you can continue with the instructions as outlined (to rename and copy the described files).
Thanks for extending the life of my Sony Dash, yet again.