As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENG FIRE WARNING AFTER T/O, BOTH A AND B LOOPS ILLUM. CAPTAIN RETARDED NR 1 THROTTLE FIRE WARNING WENT OUT. TESTED LOOPS AGAIN, NO TEST ON LOOP-B. REPLACED LOWER COMBUSTION CHAMBER MODULE LOOP ASSY, ALL CHECKS GOOD, RAN ENG TO TAKEOFF POWER AND NO DEFECTS.