What was found
IN-FLIGHT FIRE WARNING AFTER DEPARTURE, THE NR1 ENGINE FIRE WARNING ILLUMINATED. THE FIRST FIRE BOTTLE WAS DISCHARGED AND THE CREW ELECTED TO RETURN TO POINT OF DEPARTURE. EN ROUTE BACK TO DEPARTURE, THE FIRE WARNING AGAIN ILLUMINATED AND THE SECOND FIRE BOTTLE WAS DISCHARGED. AT THIS TIME IT IS NOT KNOWN IF THE ENGINE WAS SHUTDOWN. AN UNEVENTFUL LANDING WAS MADE. TROUBLESHOOTING IS ON-GOING.