42 Design services, namely, design and testing of power switching and control components and equipment for aerospace, aircraft, rail, defense and high-end industrial applications; engineering services for the aerospace, aviation, communications, telecommunications, computer, electronic data storage, and national defense industries; custom design and engineering of power distribution assemblies, relay and central warning panels, ground fault interrupter (GFI) units, thrust reverser control units, electrical load control units (ELCUs), contactors, wiring integrated assemblies, windshield anti-ice controllers and weapons release boxes; custom design and engineering of electrical equipment; technical support services, namely, troubleshooting in the nature of diagnosing computer software problems