Just took over a new account with 3 dmc1 a group of 2 and a simplex frt. building said the previous company had just replaced the clc board and it ran fine for a while then someone got stuck and they shut it down. Issue I find when I get there is as soon as I put power to the cop it takes both cars in the group out of service. Hall calls won’t latch and both cars just stop. Not sure how to troubleshoot with the tool without taking both cars out by putting power to clc to hook up and check comm and parameters. Any ideas are greatly appreciated.