As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF FROM SJU, NR 1 ENGINE FIRE WARNING LIGHT ILLUMINATED. SHUT DOWN ENGINE, LIGHT REMAINED ON. DISCHARGED BOTH LEFT ENGINE FIRE BOTTLES. WARNING LIGHT CONTINUED TO ILLUMINATE. AIRCRAFT RETURNED TO SJU WITHOUT INCIDENT. MAINTENANCE FOUND MOISTURE SHORTING FIRE WARNING LOOP CONNECTORS ON ENGINE. MOISTURE REMOVED AND SYSTEM OPS NORMAL.