Color differences can be cause by incorrect configurations and in some cases, different strings. Different string types tend to have different color orders and if that;s the case, I would reprogram that channel with a different color order to correct that. As for the non functional channel, I would remove the Pic and check for bent pins and while it is out, reflash it. Also check the socket for cold solder joints and check the fuse, it may be blown. Actually, I would check the fuse first.
