Asa tangential topic, last year I ran into an issue where the Sync 3 module was not powering down; the screen would look like it went dark, but when you looked at the screen in pitch-black dark, it was still glowing. This was giving me about 0.5 amp/hour of power drain (yeah! It was crazy!).
I Googled - nothing. I called 4D Tech thinking that they probably knew the Sync 3 system better than anyone, and they were extremely helpful. The tech talked me through how to reset the module - problem solved.
If I ever need anything they sell, I for sure would go back to them. They do sell the
Sync 1 to Sync 3 upgrade.