As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF FOR A FIRE DISPATCH , THE NR 1 FIRE LIGHT AND BELL SOUNDED. THE LIGHT AND BELL QUIT AFTER THE POWER WAS REDUCED FROM TAKEOFF POWER. AFTER LANDING , MX FOUND THAT THE POWER TURBINE ON THE NR 1 ENGINE HAD FAILED. THE NEXT DAY THE ACFT WAS FLOWN ON 3 ENGINES FOR FURTHER MX.