As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK, 1 TO 2 MINUTES AFTER DEPARTURE THE NR 1 ENGINE OVERHEAT LIGHT ILLUMINATED, THEN NR 1 ENGINE FIRE WARNING LIGHT ILLUMINATED. ALL LIGHTS EXTINGUISHED WHEN THROTTLES RETARDED FOR DESCENT. REMOVED AND REPLACED NR 1 ENGINE CONTROL PANEL AND NR 1 FIRE DETECTOR UNIT PER MM.