The 'LRU Information' Window displays the status, serial numbers, and software version numbers for all detected system LRUs. The system displays a green check for each active LRU. A yellow '!' indicates a failed or missing LRU. Inform a service center or Garmin^® dealer if an LRU has failed. Pertinent information about the airframe including the system ID number, system software version number, and aircraft IDs can be found by touching the AXIS™ button in the 'LRU Information' Window.