I received a call from a customer saying some of his keypads were no longer working. I found 10 out of 15 keypads were not working. Single led lit on the top of the keypad. I did a diagnostic and no keypads were showing up. Even though some were working. I disconnected all of the keypad feeds and tested each feed individually thinking a bad keypad may take down the entire link. Each feed tested fine and by the end, all keypads showed up. But when I connected all of the keypads back up, nothing would show up. I have a call into tech support and am waiting to hear back but my initial thought is the 15v power supply. Thing is when I metered the power supply it read 16.5vdc. Anyone have this issue? Toph