As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN-FLIGHT, THE RT HAND ENGINE FIRE DETECTION LIGHT ILLUMINATED THEN WENT OFF AND BACK ON AGAIN AND DID NOT GO OUT UNTIL LANDING. AIRCRAFT HAS BEEN SOAKED BY RAIN PRIOR TO THE FIRST FLIGHT OF THE DAY. INSPECTED ENGINES, NO EVIDENCE OF FIRE FOUND. CLEANING MOISTURE FROM FIRE DETECTORS, FOUND SERVICEABLE.