As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, THE NR 1 ENGINE FIRE DETECTOR LIGHT ILLUMINATED ON THE WARNING PANEL. THE AIRCRAFT RETURNED TO THE HELIPAD WITHOUT INCIDENT. DURING THE INSPECTION OF THE SYSTEM IT WAS FOUND THAT THE FIRE DETECTOR CONTACTORS WERE WET FROM A PREVIOUS RAIN STORM. THE CONTACTORS WERE CLEANED AND THE SYSTEM WAS OPERATING WITHIN LIMITS.