We recently had a DMC down for nearly two weeks! It ran with the cab lighting turned off though!! What we learned was that the day before we were called a electrician replaced a ballast or whole fluorescent fixture and it was generating some noise on the line causing all kinds of weird stuff like hall calls flashing, both front and rea doors jerking open and close. It wasn't until we got our hands on a fast tool we could see our com going on and off the world tool is much to slow. And a engineer told us he has seen this 3 maybe 4 times in his 35 years! Lol
