I have a 5034NS 4 channel Sceen Controller. When it was programed with an old beta version of tool kit 1 button stopped working. I reprogramed with old 16 Bit software. This did nothing. I have reprogrammed with latest tool Kit. Button still stuffed. I sent in for warranty repair. It was fixed with this analysis Unit Fault "Key for not responding" Tested Unit Found key 4 did not respond Checked Customer settings OK Changed Group addresses and setting Key 4 still failed. Download default settings Key 4 OK Tested OK Corrupt Eprom setting /bit error in micro Is the Line "Downloaded default settings" something us installers can do ?? If so what is the process ?? Charles