As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 50 FT ON LANDING GOT NR 3 FIRE WARNING. AFTER LANDING THE THROTTLE WAS MOVED TO IDLE AND LIGHT REMAINED ON AND FIRE BELL SOUNDED. SHUT DOWN FUEL SW AND PULLED FIRE HANDLE ON NR 3. FIRED AGENT, NO SECONDARY INDICATIONS. FOUND PER CFDS NR 3 FDCU AT FAULT. REPLACED SAME AND REPLACED NR 1 BOTTLE AND CARTRIDGE. ALSO, CKD NR 3 ENGINE FOR EVIDENCE OF FIRE. FOUND ALL OK, FINAL FIRE WARN TEST OK.