Lighting elements are disposed within the enclosure doors surrounding an automated material handling machine such as a packaging machine. The clear panels in the door are edge-lit so that the entire door window corresponding to the location of the maintenance notice is illuminated a contrasting color to call the operator's quick attention to that portion of the machine. A method of notifying the operator of a maintenance issue in a particular portion of the machine is provided by illuminating a window panel in a door of the machine enclosure.