David, I'm sure Nick would remind you "sold as seen....". It was working fine when you bought it.... All of our CVRT's were first put together using components the army has discarded for a reason- they don't work! (but you don't know this until you try them). We then have to find bits that do work.
CVRT's seem to become allergic to their owners at times, and become very frustrating. You find that when they fail, by the time you get the deck off to investigate the fault, it has disappeared!