Had a remote chassis controlnet card fault last night. I am running controllogix platform. CNB/E card, the fault was FAIL:T006. The i/o was flashing red...it is a 7 slot chassis with all dc input/output cards and one devicenet card in it. The status indicator was solid red, so i tried to power both remote rack and processor off...no luck same thing...replace the controlnet card and all was well. What would have caused this or is it something that will come back? Any thoughts from the guru's...lol