As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED AFTER DEPARTURE FROM ADS FIRE HORN SOUNDED WITH NO FIRE INDICATION LIGHTS, RETURN TO ADS FOR MAINTENANCE. MAINTENANCE FOUND FIRE LOOP GROUNDING OUT ON ENGINE DRAIN MAST ON THE NR 2 ENGINE REPOSITIONED AND OPS CHECKED NORMAL AT THIS TIME.